It's 4:00. A guy comes in, stands at the counter.
Mary: "Can I help you?"
Guy: "Um... Yeah, I had an appointment today at 1:00, and I got called into work, and called you at around 9:00 to cancel it."
Mary: "Yes... I see that on the schedule. Did you need to reschedule?"
Guy: "I'm not sure... I mean, you're not angry at me, are you?"
Mary: "Uh, no, these things happen."
Guy: "Okay, I've been really worried about that. Thanks!"