“We cannot have a call at the time you requested. Choose another time.”
That’s how a machine might say it.
A negative, followed by a task to do.
“I’m working to help schedule that call as soon as possible for you! I have a call booked already at that time, but I’ve set aside Wednesday 9:00 am EST, if that works for you?”
That’s how a human might say it.
A positive, followed by a problem solved.
It’s a small difference that makes you a positive problem solver, rather than just the bearer of bad news.
Isn’t that better?