Automate Appointment Phone Reminders with Google Calendar & Retell AI

This n8n workflow automates phone reminders for appointments by triggering daily at 9 AM (configurable), fetching Google Calendar events within the next 12 hours, parsing event descriptions for client name, E.164 phone number, appointment reason, and times via a Code node, then using Retell AI to initiate personalized calls.

Key benefits include seamless integration of calendar data with AI-powered voice calls, ensuring clients receive timely reminders without manual effort. It minimizes no-shows, boosts efficiency for service providers, and scales effortlessly for high-volume scheduling.

Ideal use cases: healthcare clinics reminding patients, salons confirming bookings, consultants scheduling sessions, or any service business combating missed appointments. Setup requires Retell API credentials, Google Calendar auth, proper event formatting, and a registered Retell phone number.

The workflow handles multiple events per run, supports customization of trigger timing, and ensures secure credential management, making it a robust solution for appointment-heavy operations.