TNT,
To answer part of your question: No, I don’t think that they would let you know if for some reason your appointment was cancelled. A) I think that would just be too much work for them to keep track of, and B) I’ve never given a Ph# or email, just my name, when making an appointment…for discretion’s sake I’d guess. Perhaps if you requested to be informed of a change they might accommodate, but most likely they’d apologize and suggest another very lovely lady to meet you in her stead.
That said, I think it’s fairly unusual for that to happen.