Had a few like this.....
Twice with the same girl, both times it been to try and change the times when I was already on my way, probably thought she could fit another punter in before I got there, problem being that I have to operate to a bit of a schedule so not always possible to delay. Ended up never seeing her again.
En-route with about 90 minutes drive, all confirmed before I left home. First time, a call to say sorry now I can't make it - so stop at next service station to organise a plan B-Z etc (this was early into my punting days). Second time, was perfectly fine when I chatted before leaving, then once en-route a call to say not feeling well, can I make next day? Sorry love, no can do, thanks and goodbye.
Another time, got to the hotel, text to say I was there - nothing. Called - nothing. Turns out the hotel had twigged to what she was doing and chucked her out! However, her phone was still in the room. Eventually she got another hotel and we rearranged - with a discount and more time for the inconvenience.
Now, always have a plan B-Z.