answer: #Person1# calls Mr. Brown but #Person2# says Mr. Brown is out for lunch and asks #Person1# to leave a message.
documents: #Person1#: Hello, may I speak to Mr. Brown?
  #Person2#: I am sorry, he is out for lunch. Would you like to leave a message?
  #Person1#: Err, what time do you expect him back?
  #Person2#: Say, in half an hour.
  #Person1#: Thank you, I'll try back later.