I have run across a situation recently with a couple of ladies that I had been hoping to see when they came to town, where I asked for a specific time slot and was told that the time slot was being reserved for those willing / looking to book multiple hours. Because of many circumstances, I can only book for one hour, so I was not able to get the desired time slot, and thus could not schedule with the lady.
 
This has happened more than once recently. Has this happened to other people? Is this a new common practice?

She gets to run her business the way she wants.  If it doesn't work for her she'll change it. Not sure what part of the country you're in but generally there's lots of fish in the sea.  If not, you need to move. Or see Rosie Palm.

When a popular visiting provider comes to town, horny mongers swarm her inbox. Since any reasonable gal can only see X number of guys in a day, your best bet is to try another day or book multiple hours.  

For what it's worth, some providers post availability in areas in which they are pre booking / touring. In those cases, if you are the only fish that is biting, a one hour appointment may not be worth her taking a trip to the area she is looking to tour. Don't take it personal, it is just all a matter of efficiency and courtesy. At least she didn't just book you, only to cancel or no show. No one loses. It isn't personal. Good luck

Your point is well taken, it's a lot better that she is upfront about it, rather than booking his appointment only to be a no show when she gets that better offer that she wanted all along.

As for what to do, the answer is simple, move on to the next lady on your to do list, as Sarah so accurately stated,'"No one loses"

One last thing, touring is much different than providing locally, like any other business that requires an investment up front by the "company" the lady runs a very real risk of not only not making any money, but having her expenses actually exceed what she brings in which would mean posting a net loss in addition to wasting her time. You can't really blame a lady to taking steps to ensure that she at least breaks even for her trip, now can you?

happens all the time..get over it!..

I have heard of it and agree with them if you were a provider would you rather book 4 - 1 hour slots in a day or 2 - 2 hour slots or hell the gravy 1 slot in a day that pays for the trip! Personally if the girl is really hot and touring 1 hour does not do it you have to go with 2 hours and with that you will be given a preferential slot (no pun intended LOL). Also do you want to see a provider that has been with 25 guys before you in the city or do you want to be #1 or #2 on that list. Me I prefer to pick them up from the airport and help them with their luggage.

Should I be honored or very afraid lol?