"Hello?"
"Hi, it's Ava calling from Kenny's Auto. Quick one: who looks after servicing on your work vans?"
"That'd be me. What's this about?"
"Kenny's got Thursday at 10 or Friday at 2 open for a look. Which one suits you?"
A real conversation, not a recording.
Ava talks like a person who works for you. It takes the brush-off without arguing, asks one good question, and offers two real times instead of an open calendar. When someone says yes, the meeting drops into your calendar as an invite with them already on it, and the follow-up emails start going out from your own address.