I have built several AI receptionists in my practice. An AI receptionist cannot fully replace a human: live conversations have too many scenarios and nuances. If you want to sell or talk to your clients through artificial intelligence only, you are heading for a failure
Where a bot does the job
You can delegate part of the communication to an AI receptionist. It works well where there is a strict sequence and a small number of script steps: booking an appointment, answering three typical questions, sending a reminder. The client got what they came for and never noticed they were not talking to a person

Where disappointment starts
If the conversation requires a long dialogue and talking a client into a decision, you will most likely be disappointed. Artificial intelligence cannot hold a long chain of conversation by fixed rules: three or four steps into the script it starts losing the thread, and the client starts feeling the canned answers

An honest note on leads
A note on leads. A bot brings leads when it answers faster than a competitor picks up the phone: at night, on weekends, at peak hours. It stops bringing leads the moment it tries to sell on its own - at the "why are you more expensive" stage it always loses to a live receptionist. Count booked appointments after the dialogues, not the dialogues themselves
Handing over to a human
Finally, the bot and the live receptionist need a clear handover rule. The bot answers typical questions and books appointments. As soon as the talk leaves the script - into selling, objections, an argument - it hands the dialogue to a human and sends them a short summary: who wrote in, what they asked, where the conversation stopped. A client should never have to repeat their question twice - that is the real sign the automation is built right
How to delegate without failing
Delegate carefully and step by step: give the bot the simplest and most frequent scenarios first, read the real dialogues, then add the next step - and do not build complex end-to-end processes right away. A human stays in charge of selling, handling objections and difficult cases
On my site I break down how an AI receptionist works: which tasks it takes over and where a live employee takes the conversation back