Between your message and the confirmation there is a short interval in which the actual work of the booking gets done. Most of that work is three questions, asked of you if the first message left them open, asked of the rota if it did not. They are worth explaining, because guests who answer them unprompted routinely have a therapist at the door while others are still mid-correspondence.
First: which building
Not out of curiosity, out of cartography. The building fixes the quarter, the quarter fixes which of the fifteen is nearest, and nearness is the entire secret of an honest arrival time. It also settles practicalities the guest cannot see: whether the lift needs a keycard, whether the entrance changes after midnight, whether two visitors should arrive together or a minute apart. A name is ideal; a street or a quarter will do to begin. The room number is never needed until she is minutes away.
Second: the shape of the hour
Which form, how long, one guest or two. These three facts decide what goes into the bag, sheeting travels for nuru and stays home for tantra, and whether one woman comes or a practised pair. They also shape whose name fits: the women on the roster are not interchangeable, and each one takes the forms she knows best. A guest who writes only massage, tonight receives a sensible default; a guest who names the form can ask for a woman who specialises in it.
Third: what the room changes
Anything the venue does that a floor plan would not predict. A partner asleep in the second bed of a family room. A bathroom under the eaves with no standing height. Heating that takes an hour to mean it. None of these cancels a booking, each one merely bends the choice of form or the packing of the bag, and it bends them gracefully only when known in advance.
And what is never asked
Your surname. Your reason. Who the second guest is to you. Why three in the morning. The house's questions all point at logistics, and stop precisely where logistics stop. What a guest chooses to volunteer is used for that booking only; what he chooses to withhold was never required. The whole catechism exists so that the knock lands at the right door, at the agreed minute, with the right things in the bag, and it has no other ambitions whatsoever.