Today I got a call from my coworker asking if I was coming into work. He said that the schedule had been changed because someone else wasn't able to work. I didn't get this call until 8 minutes after I was supposed to be there. Apparently the schedule was changed without anyone knowing, and this also caused problems yesterday for another coworker. How do I go about talking about this with my boss or a manager tomorrow when they will most likely ask me why I didn't go into work? To be fair, if I had been notified even a couple of hours beforehand, I would have went to work.
Edit: for clarification, I work in Mississippi.