Summary
Saying no is difficult for many people, when it should or could be a sign for both parties. Think about it in a different way.
Saying no is difficult for many people. It’s also a big stressor for many. Often the reason behind it is not wanting to disappoint the other person.
And if that’s the case, then you’re doing it because you believe you know what’s good for them.
But what would be really good is to say no, to make it clear that you either don’t have the time or you simply don’t know the answer. And move on. It’s a sign of respect for both of you.
You’ve given a clear answer and not raised any expectations.
If someone asks you for help and you don’t know how to help or you don’t have the time, what’s better for them? To make a promise that you can’t keep (and that may leave you feeling stressed) or to say clearly that you can’t do anything about it?