Four very different requests on one line
In heating and cooling, four completely different calls arrive on the same number. "I have no heat" has nothing to do with "I want a quote on a heat pump", which has nothing to do with "I would like my fall tune-up", which has nothing to do with a customer already covered by a maintenance plan. Running all four through one script means a breakdown waits behind a price shopper.
Your receptionist identifies the path before she qualifies. She takes the name and callback number, asks what kind of request it is, and branches. A breakdown during an extreme-cold warning, or dead cooling in a heat wave at an elderly person's home, goes straight up; a tune-up request waits for the end of your day.
And if the caller mentions a gas smell, a hiss near a gas appliance, or a carbon monoxide alarm going off, she drops the script entirely: get everyone outside, touch no switch and no flame, call 911 and the gas distributor's emergency line. No appointment is booked in that case.