The time slots are the neighborhood's most useful quirk. With people arriving and leaving at all hours, it is not unusual to find availability very early or well into the night, something that barely exists in the residential areas of the coast. If your schedule is awkward, this is where you have the best chance of someone covering it.
The opening message works best when it is concrete: day, rough arrival time, how long you have in mind and whether there is a cut-off. If you are passing through, say so; it completely changes how the agenda is built on the other side. With that information, confirmation is usually settled in the same exchange, with no back and forth.
As for what you can ask for, the dominant format is a visit to your address, so most escorts work with offers designed for that: meetings of an agreed length, massages, and the relaxed manner usually described as GFE. Company for going out is requested less and, when it comes up, tends to point toward the neighboring areas.
One last practical tip: confirm how she is getting there. Ask whether she comes under her own steam or expects you to arrange the ride, and settle who sends word when she is close. Those are two one-line questions that avoid the area's most common scene: two people waiting in different places at the same time.