My T did her own schedule. I had my own slot most of the time with changes here and there. If she needed to see me on a different day sometimes it was first come for serve but then she had those that she would give them the ability to choose first. I know when I started due to my schedule she would let me choose first. That's what she verbalized. I had my time slot but then if she needed to change days then things got a little hairy and she woul forgot if she scheduled me or not although she has a book.