I have a family dinner that I only just recently heard about, I called in for work 3 hours before my shift letting them know and I get told “do you think that's an acceptable reason to call off a shift on the day?” Like dude, yes I do think it's an acceptable reason and when you advertise the “at least two hours” method, I expect you to follow through with it and not try to guilt trip me. 🙂 Not to mention that I'm taking a shift on a Saturday even though I wasn't previously working that shift, so basically, it's just a fair trade of hours/inconvenience.