Try this
- Give enough information about the favor’s size and timing to make the capacity question answerable.
- Wait for willingness before supplying a full set of instructions. Keep an alternative in mind if the task cannot be accepted.
A worked example
“Do you have room for a small favor, or should I find another option?”
An invented example to adapt, not a real exchange or a script you have to follow.
Before you leave it here
If capacity is absent, use your alternative without making the refusal into a relationship verdict.