answer: A phones for Tom. #Person2# tells A Tom isn't available, so A requests #Person2# to leave a message.
documents: #Person1#: Hello, Can I speak to Tom, please?
  #Person2#: I'm afraid he is not in at the moment.
  #Person1#: May I ask what time he will come back?
  #Person2#: I think he will come back at 3 p. m. Do you want to call later? Or would you like to leave a message for him?
  #Person1#: I'd like to leave a message. Please ask him to call me back as soon as he returns. I'm A and he has my number.
  #Person2#: OK. I will do that.
  #Person1#: Thank you very much. Bye.
  #Person2#: You're welcome. Bye.