Latenode
Cal.com
OpenAI GPT Assistants

Automate WhatsApp booking with GPT-4 assistant, Cal.com, and SMS

This automation streamlines the appointment booking process for businesses that handle client scheduling via WhatsApp. It uses a GPT-4-powered AI assistant to interact with users, collect booking details, and initiate the scheduling in the Cal.com calendar platform.

The workflow also sends automated SMS reminders to clients before their upcoming sessions, ensuring no-shows are minimized. This solution is designed to eliminate the manual effort required to respond to booking inquiries, suggest available times, and follow up with clients, allowing business owners to focus on serving their customers.

Updated Apr 2, 2026Est. run: 23sEst. cost: $0.0014
How Latenode estimates time and cost

Latenode bills workflow runs in credits: 1 credit = 30 seconds of processing. Minimum charge per run depends on your plan. Plug-and-Play (PnP) AI nodes are billed separately—each PnP token is $1 USD, charged pay-as-you-go at vendor cost plus a small processing fee, with no API keys required.

Full pricing — how credits work →
AI agents & chatbots

Workflow preview

What this template does

  • Automates appointment booking via WhatsApp using a GPT-4 AI assistant
  • Collects booking details from users and schedules them in Cal.com
  • Sends automated SMS reminders to clients before their upcoming sessions
  • Eliminates manual effort to respond to booking inquiries and follow up
  • Allows business owners to focus on serving customers instead of scheduling

How it works

1
Trigger

Receive WhatsApp Booking

The workflow is triggered by an incoming WhatsApp message from a client requesting an appointment.

2
AI

AI Booking Assistant

The GPT-4 powered AI assistant engages the client, collects their booking details like date, time, and service required, and confirms the availability of the requested slot.

3
Action

Process Booking

Once the booking details are collected, the workflow creates the appointment in the Cal.com calendar platform and updates the prospect's information.

4
Action

Schedule Appointment

The workflow completes the booking by scheduling the appointment in the Cal.com calendar.

5
Logic

Check Booking Status

The workflow checks the status of the booking, handling any errors or issues that may have occurred during the scheduling process.

6
Logic

Check Upcoming Appointments

The workflow runs on a scheduled basis to check for any upcoming appointments and prepare to send SMS reminders to clients.

7
Action

Send SMS Reminder

The workflow uses the sms77 service to send automated SMS reminders to clients about their upcoming appointments, helping to minimize no-shows.

Setup guide

1

Add Cal.com Credential

1. Go to the Latenode Credentials panel. 2. Add a new credential for Cal.com. 3. Enter your Cal.com API key and calendar ID.

2

Configure OpenAI GPT-4 Credential

1. Go to the Latenode Credentials panel. 2. Add a new credential for OpenAI. 3. Enter your OpenAI API key.

3

Set up SMS Notifications

1. Go to the Latenode Credentials panel. 2. Add a new credential for sms77. 3. Enter your sms77 API key and sender ID.

4

Connect Google Sheets

1. Add a Google Sheets node to your workflow. 2. Authorize the Google Sheets integration in the node settings. 3. Select the Google Sheet and worksheet you want to use.

5

Configure Webhook Trigger

1. Add a Webhook trigger node to your workflow. 2. Set the trigger URL and request method. 3. Map the incoming WhatsApp message data to the node fields.

Requirements

Create a Cal.com account and obtain an API key to manage appointment bookings
Obtain an OpenAI API key to use the GPT-4 AI assistant for user interactions
Enable the WhatsApp Business API and obtain the necessary credentials to send and receive messages
Configure the SMS integration to send automated reminders to clients before their scheduled appointments

FAQ

Common questions about this template

Each run uses credits on your Latenode plan. We charge for processing time (1 credit = 30 seconds). Your actual cost depends on your plan and how long the run takes. See pricing plans for plans and how credits work.
Contact support →

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