AI Phone Agent: Retell, Google Calendar & RAG

This n8n workflow builds an AI-powered phone agent using Retell for voice calls, integrating Google Calendar for seamless appointment booking and a RAG system for intelligent information retrieval. It handles incoming calls, transcribes speech, processes queries (e.g., store hours, policies), books slots directly into calendars, and responds naturally via voice synthesis. Setup includes purchasing a dedicated +1 phone number linked to the agent, leveraging $10 free Retell credits for cost-free initial operation.

Key benefits include 24/7 availability to reduce staff workload, easy customization in n8n, and flexible integrations for various tools. It automates repetitive tasks like FAQs and scheduling, saving time and costs for businesses while providing scalable customer support.

Ideal use cases span e-commerce (product inquiries), retail (hours/policies), restaurants (reservations), service providers (consultations), and local businesses (phone support). The workflow captures call events, routes to RAG for knowledge-based answers or calendar APIs for bookings, ensuring accurate, context-aware interactions without live operators.