Mine used to try to get me to do this. After making, and subsequently rescheduling, a couple of appointments at times that were inconvenient for him, I told him that he needs to do it himself. He always claims that he doesn’t have time to make the call. I can understand being really busy at work, but he manages to eat lunch – often while working – so he can take the two minutes to make that call. It hit me how ridiculous it was for me to make an appointment for someone who is busy when I had to re-schedule one of these appointments for the third time. The only one that I make now is the dentist because we go together. And I make him tell me a day that he can take a half-day from work.
As well as being busy, he is a bit of a social phobe, so any contact with the outside world beyond what is necessary makes him uncomfortable.