I sometimes want to set an appointment for the same day, and I really can't talk on the phone, either people around, clients, etc... but I will e-mail a service or Indy, and tell them that I would like an Appointment. I sometimes get an answer in a short time, but more times than not, I don't get an answer till late in the evening, or the next day. I can understand an Indy, busy with clients, but a service should have some one to answer e-mails in a timely fasion. I think the way the world is now, more people use the internet than the phone. Am I off base on this, or do you guys know where I'm coming from?

My suggestion is to try the day before, or keep trying other providers, for you may finally succeed in gaining your goal As for answering services, I prefer to do all my bookings, verification, etc.

I know my life would be a heck of a lot easier if I could pre-book, but thats the problem. I sometimes don't know I  can get out of work ( I own a pretty busy Finance Company ) until that morning. I mean its great that we are busy, but like I said, it isn't really possible for me to make appointments a day in advance.

because I have my laptop online all the time and it's easier to check mails between my appointments, than go thru 50 messages on my cell until I get to the one that is actually a sure client.
The problem with delayed responses of your mails is because not all providers have a laptop in their hotel rooms. Some use the hotel computers for their mails at the end of the day.
Now...I get lots of calls, and keep up with them is hard, because I don't like to return calls out of business hours. If I don't return a call in the same day or in the next, then I will wait for the gentleman to call me again, because I don't want to compromise his privacy and discretion.

You can try giving finding a well reviewed lady then explaining your situation to her during a pre-booking.  Some may be able to work out an arrangement with you where you pay a cancellation fee that the provider keeps if you do not show at the pre-booked time.  This would give you some same day flexibility but will not leave the provider high and dry if you do not show up.