goes with the territory. I know a lot of the older guys (me included) who book multi-hour appointments, and also tip, and Saturday is the day best suited for extended sessions because few customers work on Saturdays. So if you book an hour with a popular girl, there is a good chance you will get bumped in favor of a guy that wants two or three hours. It has happened to me on occasion when I book a one-hour session with a booker that I'm NOT high-volume with. The same thing is probably responsible for the Monday bump, although Monday's are also days when some girls will start later on short notice because they partied into the night on Sunday, their only day off, and overslept on Monday. This happened to me with a girl in November. I was repeating for two hours, so I know I didn't get bumped because a bigger fish jumped in the pond, but she decided not to start until mid-afternoon because she overdid it on her day off on Sunday, which was too late for me, so I saw her roommate, and ended up repeating with her roommate before getting back to the first girl.
There are some obvious ways to avoid this.
1) YOU be the guy that books two hours,
2) Ask the booker who else is in her lineup that IS available at the time you want. That's how I first saw Megan. I asked for another girl, but couldn't get a time that was early enough, so she recommended Megan, who went on to be a first-tier girl. There have been other top girls I have met off of a booker recommendation when I got bumped or pushed back on the time.
3) I'm not suggesting anything in particular, but if you inadvertently committed one of the deadly Kgirl sins, the girl may have told the booker she didn't want to see you again. The girls are often texted the names of the customers booked for that day if its a guy who has been there before when they get their first contact from the booker in the morning. You should replay the first session in your mind and make sure there was nothing she called you out on or objected to in the way of your behavior.