Excuse me while I have a little rant

I have a few regulars, for both massage r'n't and FS ladies. One of the FS ladies is only available on a highly irregular basis, so, last time I saw her, I said 'please drop me a text when you're next working".
A week or two passes, then I get the text "working today, available after 3.30". That fits in fine with my schedule, so, within 5 minutes of that text I reply, asking for a booking around the 3.45 mark.
Silence. ( normally get a rapid confirmatory reply)
A couple of hours later, still nothing, so I text ' is that time OK with you?".
Silence.
About 90 minutes later, a flurry of texts:
Yes that's fine.
No sorry I already have a booking at 4.00
Can see you after 5.30?
As I responded within 4 minutes, I can only assume that she had a better offer for the 4.00 o'clock slot - may be an hour booking?
Either way, I'm just a wee bit pissed off.
Rant over.