One hour of treatment, one hour of lost calls
This is the structural pain point of your sector, and it is documented as such: during a procedure you cannot pick up. An injection, a laser treatment, a facial take thirty to ninety minutes, and during that window every call goes to voicemail.
Your clientele, meanwhile, shops around. They compare clinics, read reviews, send a message and expect a quick answer. When your callback comes the next morning between two clients, the consultation may already be booked elsewhere.
Your receptionist answers while you work. She captures the project and the contact preference, books the consultation the procedure requires — because the price depends on the assessment, and some procedures cannot be booked without an opinion first — and respects the resource and equipment needed. She gives no opinion, promises no outcome, and does not mix commercial follow-up with care follow-up.