answer: Miller is calling #Person1# to reschedule his appointment with Mr. Zhang. #Person1# tells Miller that Mr. Zhang is only available tomorrow afternoon so Miller will cancel the appointment with Mr. Comet to meet him.
documents: #Person1#: Good morning, Textile Import & Export Company.
  #Person2#: Hello, this is Miller. I'm calling about the appointment with Mr. Zhang for this afternoon. Something's just come up, I'm afraid the appointment will have to be rescheduled, I'm very sorry about the change.
  #Person1#: That's all right. Maybe we can make another arrangement.
  #Person2#: You're very kind to say so. Thank you. Do you think tomorrow morning would suit him?
  #Person1#: I'm afraid there's a bit of a problem. In fact, he's booked up the whole week except tomorrow afternoon.
  #Person2#: Tomorrow afternoon, Um. . . you see, I've made an appointment with Mr. Comet for tomorrow afternoon. In order to meet Mr. Zhang, I have to cancel the appointment with Mr. Comet, I'm afraid.
  #Person1#: I'm terribly sorry, Mr. Miller, but Mr. Zhang is really busy this week.
  #Person2#: I understand. When do you think I can come and see him tomorrow afternoon?
  #Person1#: Please let me check. Tomorrow afternoon - Yes, he'll be free from 2:00 tomorrow afternoon. Do you think it's convenient for you?
  #Person2#: Yes, that's quite all right for me.