Book calendar appointments with availability checks in Google Calendar

Description

Quick overview This workflow is triggered by another n8n workflow to verify a requested appointment slot and, if available, books a 30‑minute event in Google Calendar, returning a booked/unbooked response with formatted date/time details. How it works Receives appointment details (name, phone, service type, preferred date, preferred time) when called by another n8n workflow. Calls a separate “Check Slot Availability” workflow to determine whether the requested slot is available. If the slot is available, builds ISO start/end timestamps for a 30-minute appointment window. Creates the appointment as a Google Calendar event with a summary and description populated from the input details. Returns a success payload with booked: true and formatted preferred date/time, or returns booked: false with an error code when the slot or calendar booking fails. Setup Create or identify a “Check Slot Availability” workflow and update the referenced workflow ID/name so it returns an available boolean. Add a Google Calendar OAuth2 credential and set the target calendar (email/ID) in the Google Calendar event creation step. Ensure the calling workflow passes name, service_type, preferred_date (ISO date), preferred_time (HH:mm), and phone, and adjust the default 30-minute duration if needed. Requirements External AI voice platform (Vapi, Retell, or similar) & Published appointment management sub-workflows MCP tools for Vapi and Retell voice agents A configured "Check Slot Availability" sub-workflow (or your own equivalent) Calling workflow must pass name, service_type, preferred_date, preferred_time, phone Customization Change the default 30-minute appointment duration in the event-creation step Swap the Google Calendar node for a different calendar/CRM system Adjust the fields included in the event summary/description. An n8n automation workflow template by MD Faizan Uzzaman.

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