Personally I try not to answer texts like that as theres no point, you know right from the start theres no booking in the offing, but chances are it'll annoy you......
I had a guy the last couple of days emailing me trying to get a precise location out of me with no promise of a booking.......I give a vague answer, he tries to pin me down to which I answer Yes I do (give more details), once I have a date, time and duration for a booking, and once said booking is confirmed....
Then I got a phone call an hour later, I'm sure it was the same guy, someone trying to get my address out of me, he got the same answer!
Sometimes just for fun if I'm bored I will just text back exactly what a guy texted to me if its particularly ridiculous/rude/disrespectful, such as this the other day Hi can I fuck your ur arse - he got the same text right back at him!