This happened once, when my therapist double booked and sent me packing. I had to make a second trip at the end of the day--no small cost to my day since she is in another city. In that case, I accepted. I don't think she would ever do that again, or even offer a reduced rate, even though she does it for others.

Strangely enough, the therapist of a friend of mine sent me a check as thank you for something I told my friend that was spot on. I had never met that therapist--then or since--and didn't cash the check.