answer: #Person1# calls Mr. Smith to tell him Dr. Brown won't be able to see him today and changes the appointment to tomorrow afternoon.
documents: #Person1#: Hello, Mr. Smith. I'm afraid Dr. Brown won't be able to see you today. He's still waiting for a flight out of New York. He said he would meet you tomorrow afternoon. Is it OK?
  #Person2#: Sounds good. Thank you for calling.