Sales, Marketing & SupportDone with custom-built or unnamed agent
Answer after-hours calls and book appointments
The author set up a Synthflow receptionist that captured caller details and booked next-day appointments, and a Retell agent that answered clinic FAQs and flagged frustrated callers (vendor comparison).
- What They Did
- The author built a Synthflow receptionist for a home services company in about 45 minutes with its visual builder. It answered after-hours calls, captured name, address and service type, and booked next-day appointments. Separately, for a 12-provider clinic, a Retell agent drew on a loaded FAQ document and post-call analysis flagged frustrated callers for same-day follow-up by the office manager.
- How It Went
- Synthflow handled simple intake well across 30 test calls, but looped back to the start when a caller rescheduled and changed service. Retell flagged 3 frustrated calls out of 80 tests, with no hallucinated FAQ answers.
- Worth Knowing
- The author works for Retell, so the comparison favors it. Synthflow's Pro plan was about 700ms latency and $450/month, and the agent was weak off-script.
Try it yourself with custom-built or unnamed agent
Help me build an after-hours receptionist workflow for [my business type]. It should answer calls or messages outside [business hours], collect the caller's name, phone number and reason for calling, answer these common questions: [list of FAQs], and offer next-day appointment slots from [my calendar]. Flag callers who sound frustrated for my follow-up. Before it books anything or sends any message, pause and show me what it is about to do. You're done when I've tested it with a sample call and seen the booking and flag work.