Try this
- Answer the request directly, then state what you can offer only if there is a real alternative.
- Leave the other person free to say the alternative is insufficient. A different offer does not automatically resolve the original need.
A worked example
“I cannot call every night. I can usually manage a longer call on Sunday.”
An invented example to adapt, not a real exchange or a script you have to follow.
Before you leave it here
Offer the alternative only if you mean it, and allow the other person to say it does not fit.