Even the most considerate of punters and escortscan have things come up, and even if both sides do everything they can to avoid it happening, it will sometimes still happen. An unfortunate part of the process, I'm afraid.
But there's still no excuse for the blatant piss-takers and time-wasters that escorts have to deal with. It's been said on many threads over the years about how bad this phenomenon is in Ireland, with some ladies getting 7 or more no-shows booked in a single day.