One man once wanted to book at my then social rate for an indeterminate time, with option to extend and go back to mine.
Nice idea but doesn't work for me, with other offers of bookings I am not prepared to put aside my whole evening for a 50% of usual rate fee, just incase he extends. I also need to know intended movements so my security buddy is in the picture.
I have had the reverse happen, client booked social coffee time to see if we'd get along, he then decided he wanted private time but I didn't have the time. He was quite disgruntled - but that isn't my fault - the only way I could have seen him on that day, at the time convenient for him was that hour and he wasn't wanting to commit to anything else.