So you've got a booking. You allow plenty time. You drive, take a train, a tube and arrive at the place.
You check your punting phone and while you've been travelling, there's a message from the WG "can't make it, my period came, really sorry" or words to that effect.
How often is that genuine, if ever? Or how often does it really mean :
I can't be bothered today
My regular booked instead
I suddenly decided to do something else / go somewhere else today.
And more importantly, if it happens, does it mean a negative review?