I can't see the point.
You take a call today at lunch time to book Mrs Smith at 10 am on a certain day. In the mean time, Mrs Jones books you for the same time and day from your web site.
When you get home, you find your double booked.
Apart from that, bookings may not be straight forward.
What if you've booked two EOT jobs for the same day on line and one takes all day?
I find women especially to be minimalistic or not knowing what room sizes they have when communicating via the interweb....eg, I just have two rooms, then when you get there, they can be like football pitches.
So it all gets rather complicated and in my opinion completely unworkable.