answer: Mr. Cook tells #Person1# to leave a message to let Mr. Baker call back.
documents: #Person1#: Hello, Oriental Hotel.
  #Person2#: I'd like to speak to marked Baker, please.
  #Person1#: I'm sorry, Mr. Baker's not in. May I take your message?
  #Person2#: Yes, tell him Mr. Cook called and ask him to return my called as soon as he back.
  #Person1#: Alright. Mr. Cook, I have Mr. baker called you back as soon as he gets here.