answer: Steven calls for Mr. Brown who isn't available, so Steven requests #Person2# to leave a message.
documents: #Person1#: Hello? This is Steven. I'd like to speak to Mr. Brown, please.
  #Person2#: I'm afraid he is not in at the moment.
  #Person1#: Then what time do you think he will be in?
  #Person2#: I suppose he won't come back until 6 p. m. By the way, do you want to call later, or would you like to leave a message?
  #Person1#: I'd like to leave a message. Please ask him to give me a call as soon as he returns. He has my number.
  #Person2#: Okay, I'll do that.
  #Person1#: Thank you. Bye-bye!
  #Person2#: You're welcome, bye!