Ok so I work for a fast food pizza chain in a small town, there's me and one other regular driver who just happens to be the managers son. I started about 2 weeks ago and let them know I am unavailable for scheduling on Mondays, Tuesdays, and Wednesdays which they seemed fine with at the time and quickly signed me on. I did some light training the first Wednesday because it would only take a few hours on a computer, but now my manager seems to think she can schedule me this upcoming Wednesday because the other driver (her son) has a dentist appointment. I tried to point out I'm not available on Wednesdays but she just brushed me off saying she needed me and joked saying “don't get mad yet.” I've only been here a bit and kinda need the job but I dont want to get walked over like this. Any advice would be appreciated as I am a very anxious person and hate confrontation.