I'd say a booking agent saving them would be a definite no-no.  

If it was the girl herself that saved them, it would depend on, first, who she was and how well you knew each other, and second, why she saved them.

I had something like that happen to me recently except it was a civilian provider and not a PS. I saw this woman 2 years ago which I regret because she totally misrepresented herself, long story short she was a pig. Out of all the providers I have seen this woman always sends me advertising emails every couple of months which I don't care to get I just delete them. Plus I don't have her cell number because she called me from a private number when we met. That is the background story.

But long story short her "husband" emailed all the men on her email list attempting to blackmail us if we didnt give him x amount of money or he will publish all our info to our employers, family, etc. I was like wow someone I saw 2 years ago that went well, that I thought nothing of, comes back tries to blackmail me. Lol...really??? Wtf.

i've had this happen.  I don't like it, unless they are UTR, and i've actually seen them.  If i have not seen them, or had any correspondence, then i don't want them contacting me.

If it was someone who travels, that I've seen and developed a rapport with . . .

and she just used it to remind herself to let me know when she was going to be in town, no, it wouldn't piss me off a bit.  As with all such activities, the individual's intent is the key.