"My team arranged a regular Tuesday meetup in the city, but I have a haircut booked at 10am near home. I'm going to stay home today and Zoom the team instead."
"We have a regular catchup meeting at 3pm each day, but my kid has a concert at 3:30pm today. Can we reschedule the meeting?"
I've got a day full of planned customer calls, but my internet is being very unreliable due to an upgrade happening down the street. I'll cancel my customer calls.
A medical emergency has happened, and I need to take the morning off / go to the hospital / vet.