Built a production voice AI booking system for a car rental company. A GoHighLevel voice agent (GPT-4o) answers live calls, understands what vehicle the caller wants, checks real-time availability through n8n webhooks connected to the rental platform's API, and creates the booking end to end. Replaced a Make middleware layer with direct n8n orchestration, and built vehicle-category resolution plus natural spoken formatting for prices and mileage. #VoiceAI #n8n #GoHighLevel