Shops usually use a note book or a whiteboard. Includes each ladies name, and the hours of the day (10,11,12,1 etc)
It doesn't matter the mode of booking, the shop just needs the fake name of the punter and the time requested
If you are driving over an hour, or paying more than $200 for a punt, you should book and then ring to confirm as you are start off your driving. Unless you don't mind a bait and switch as you walk in the door