I'm not bothering to use *available today *anymore to pay for numb skulls to keep messaging are you available today 
I no longer even reply and guess what they don't even call

My response is sometimes 'no I just put AT on to waste guys time'. Funny, they don't book either.

Usually I turn the question back on them and ask when they want to book

I use the AW Booking Availability, my response is that this is up to date, please make a booking.

Me too and it's much simpler and less time consuming. They know what their schedule is that day so should know what time suits them. I ask them to tell me and that I will reply by return to say ok or not.

I used to do this but many won't engage or try dodge around it or be vague.

What I do find frustrating is I am asked for soonest availability for an outcall or incall, so I give it then am I asked 'can you do any sooner?'.

Equally when I say I'm not available or fully booked 'What about afterwards?'.

I find the ones who ask this (or send other vague, pointless texts - are you working today and so on) almost always turn out to be the one who are expecting to turn up in the next half hour.

It's infuriating, and whilst I don't take short notice bookings anyway I know other people do, so leaving the lack of reading comprehension aside does it really not occur to them that time might be a factor if they text at 1.40 wanting to book at 2pm?

I just never ever answer this question. It potentially has all sorts of risk.
I simply ask when they would like to comeand for how long. If that very simple question can't be answered I block and forget. Maybe I'm getting harsh as I get older.