Appointments for delivery are date and time options provided by the online system. I was originally offered my choice of delivery dates: June 28 or June 29. Later the system reduced that down to June 28. I contacted Tesla and told them I wasn't able to pick it up until Saturday, July 1. We actually live about 100 miles away, but we planned on driving to Denver on July 1 (for another reason) and that it would make sense to pick it up on July 1 or July 3. They said the system could not be changed. I was left with the option of giving up that vehicle so they could sale it to someone else and I could take delivery sometime after June 30. They would extend my "hold" until July 1 which meant if the vehicle was still available, I could purchase it but otherwise I would have to wait for one from their inventory that met my specs or wait to have it built. I told them that is what I would do because I am not throwing away the $3K additional tax credit or making an extra trip to Denver. I pointed out that I was very disappointed with Tesla but apparently the folks I am dealing with are at the mercy of the Tesla system. At least that's what they say. What can you do if you really want the car? Furthermore, I have already installed a Tesla wall connector. Luckily, I don't NEED the car right now so I guess I can wait. Bottom line: They aren't very customer focused.