An HVAC client was losing leads every time a call went unanswered a common problem for service businesses where customers just call the next company on the list. I built an n8n system that instantly texts back missed callers within seconds, keeping them engaged instead of losing them to a competitor. From there, an AI agent takes over the conversation, answers questions, checks real calendar availability, and books the appointment directly into Google Calendar all without any manual follow-up. The result: fewer missed leads, faster response times, and appointments booked automatically around the clock.