How to Connect Your ResDiary Bookings to WhatsApp
ResDiary handles your reservations. WhatsApp is where your guests actually are. Connecting the two means every booking triggers an instant message — confirmation sent, reminder scheduled, replies handled — without your team doing anything manually.
The Gap Between Your Booking System and Your Guests
ResDiary is one of the UK's most widely used reservation platforms for independent restaurants, hotel dining, and group venues. It handles the operational side of bookings well: managing availability, floor plans, covers, and wait-lists. What it does not do is communicate with guests on the channel they use most.
Email confirmations are easy to miss. They land in inboxes cluttered with marketing, filter into promotions tabs, or simply go unread until the day before the booking — if at all. Phone reminders require staff time and often go unanswered. The result: guests arrive unprepared, or do not arrive at all.
WhatsApp sits in a different category. Most UK adults have notifications enabled and check the app daily. A message sent via WhatsApp is typically read within minutes. For a restaurant, that distinction is not a minor improvement in communication — it is the difference between a reminder that works and one that does not.
The Inference Agents ResDiary and WhatsApp integration bridges the gap. When a booking is confirmed in ResDiary, a WhatsApp message goes to the guest automatically. No manual step. No separate tool to check. The booking system and the messaging channel work as one.
What the Integration Automates
The integration handles three distinct workflows that would otherwise require staff time or a separate system:
Instant booking confirmation via WhatsApp
The moment a reservation is confirmed in ResDiary — whether booked online, over the phone, or via your website — a WhatsApp message is sent to the guest. It confirms the date, time, party size, and any special notes. The guest has a record in the app they already use, not buried in an email they may not check.
Automated pre-visit reminder
A reminder message is sent automatically at a configured interval before the booking — typically 24 hours out, though this can be adjusted. The reminder gives the guest an easy way to confirm, amend, or cancel. Guests who cannot make it are prompted to respond rather than simply not turning up. This is the primary mechanism for reducing no-shows.
Two-way guest reply handling
When a guest replies to a confirmation or reminder — to ask a question, change their time, adjust party size, or cancel — an AI agent handles the conversation in real time. Routine changes are processed automatically and the booking in ResDiary is updated accordingly. Only genuinely complex situations are flagged to your team. No staff member needs to be available to handle routine replies.
Why two-way matters: A one-way notification system tells the guest about their booking. A two-way integration lets the guest respond — and acts on that response. The difference is the gap between a message service and a genuine booking concierge.
How It Works Technically
The integration connects to ResDiary via the ResDiary API and to WhatsApp via the Meta WhatsApp Business API. You do not need to change your ResDiary plan or set up a developer account. Inference Agents handles the connection at the infrastructure level.
Your existing ResDiary account stays exactly as it is. When a booking event occurs — new reservation, amendment, cancellation — the integration detects it via the API and triggers the appropriate WhatsApp workflow. From a day-to-day perspective, your team continues using ResDiary exactly as they do now. The WhatsApp side runs automatically in the background.
The AI conversation layer — which handles inbound guest replies — is powered by Claude (Anthropic). It is configured with your restaurant's specific information: your menu, opening hours, deposit policy, cancellation terms, and anything else guests commonly ask. The AI responds in your restaurant's tone of voice, not a generic chatbot voice.
Guest privacy: WhatsApp Business API requires that guests opt in before receiving messages from a business. For booking confirmations and reminders, opt-in is captured at the point the guest provides their phone number — when booking online, by phone, or in person. You do not need a separate consent process for transactional messages related to a confirmed reservation.
The No-Show Problem — and How This Solves It
No-shows are a persistent cost for UK restaurants. A table of four that does not arrive represents lost revenue that cannot be recovered. For popular sessions — Sunday lunch, Friday evening, Valentine's night — a handful of no-shows can meaningfully affect the day's takings.
The core cause of avoidable no-shows is not bad intent on the guest's part — it is a breakdown in communication. They forgot, or their plans changed and they did not have an easy way to let you know, so they simply did not come. An automated reminder with an obvious reply option changes both of those factors.
The comparison from a different sector is instructive: a South London dental practice reduced its missed appointment rate from 18% to 4% after moving to automated WhatsApp reminders. The mechanism is the same. Guests who receive a clear, timely message on a channel they actually use are more likely to confirm, and more likely to cancel in advance rather than simply not appearing.
Automated reminders via ResDiary and WhatsApp do not eliminate no-shows entirely. But they address the most common and preventable cause — guests who would have kept their booking if prompted, or who would have cancelled if it was easy enough to do so.
What the Integration Does Not Cover
It is worth being direct about the scope of the integration so you can judge whether it fits what you need.
The ResDiary and WhatsApp integration handles communication triggered by booking events. It does not manage your ResDiary floor plan, change your online booking flow, or affect how staff use ResDiary on the day. Those parts of the system stay as they are.
The AI handles routine guest replies. It does not replace the judgement call a manager makes when a wedding party needs rearranging or a complaint needs handling with care. The integration is configured to escalate anything that falls outside routine parameters — your team receives a notification and steps in. The AI handles the volume; your people handle the exceptions.
The integration is also channel-specific: it handles WhatsApp communications. It does not replace email confirmation systems if you currently use them — it adds a WhatsApp layer alongside whatever you already have.
What It Costs
The live ResDiary integration is included on the Growth plan at £149/month. This covers the full booking confirmation, reminder, and two-way reply-handling workflow described above.
The Starter plan at £79/month does not include a live reservation system connection. It is suited to restaurants that want WhatsApp enquiry handling and AI-assisted responses but do not need the booking system to trigger messages automatically.
There is no setup fee on either plan, and no long-term contract. If the integration does not deliver what you need within the first 14 days, you can cancel.
For context: the cost of a part-time member of staff handling booking confirmations, reminder calls, and guest queries across a week adds up to considerably more than £149/month — and does not cover evenings, weekends, or the moments when the phone rings during service.
Getting Set Up
Setup takes less than seven days. After you sign up, we connect to your ResDiary account, configure the WhatsApp message templates (which require approval from Meta before they can be sent), and build the AI conversation layer using your restaurant's specific information.
We test the full workflow end-to-end — confirmation triggered, reminder sent at the right interval, replies handled correctly — before going live. You review and approve before anything reaches a guest.
Once live, the integration runs without any ongoing management from your team. You continue using ResDiary as normal. Guests receive better communication. Staff spend less time on booking admin and follow-up calls.
Use our ROI calculator to estimate what a reduction in no-shows and phone admin could mean for your monthly revenue. Or book a free call — we will show you exactly how the ResDiary and WhatsApp integration works for your specific venue.