B: Yes.at nine o'clock.
A: It isn't at nine o'clock anymore. He wants to reschedule the appointment. He said he was extremely sorry but something urgent has come up.
B: Oh,that's something unexpected. What time did he suggest?
A: He said he's booked up the whole week except tomorrow afternoon.
B: But I've got a very tight schedule tomorrow. I might not be able to make it.
A: If it is inconvenient for both parties.l'm afraid we have to cancel it.
B: I think the appointment will have to be canceled. Please inform Mr. Burton about it.