If I wanted to see them again but was just waiting until I had the horn for them in particular or felt nostalgic I'd reply with `I'm great, I'd love to see you again babe but I'm a bit skint this month and can only afford XX£ - that OK?'.
The only two who've ever texted me back, their service had gone down hill a bit though and the one I got a missed call from, struggled with my cock (dunno if she really did just have an off day for a professional sex worker and an only slightly larger than average schlong). She also just played it ice cool when I replied (in case it was the dreaded STD call).
Another sent me a funny angry message on AW like I was cheating on her for seeing other prossies, when she's only available when I'm working M-F 9-5. And she kicked me out a little bit early because I wasn't going to cum apparently. I always remember that when I read on her profile she says she's gagging for cock. Yes she is, but on her terms, and only until she's done with you.
So none of the many excellent prossies I've ever seen have given me a booty call
. I guess they've already got plenty of work because they were doing something right to start with.