Sigh. I wonder how all three of you managed to miss the point entirely - and predictably.
I couldn't care less if any girl wishes to decline a booking on the basis of whether I am white, brown, black, yellow, old, young, big, small, poor, rich, fat, thin, overendowed or underdowed. Or because I have BB'd one of their sister WGs.
The point is that part of the 'service' is efficient communication. A simple 'Hi, I'd just like to let you know that I have cancelled our appointment' is all it takes. We all know how 'communicative' they are when the readies are there on the sideboard. It takes all of 5 seconds.