Please answer the following question: Dialogue: W: Hilton Hotel. May I help you? M: Mr. John Thomas. Room 13, please. W: I'll put you through. Oh, sorry. Mr. Thomas isn't in at the moment. M: Can I leave a message? W: Certainly. M: Have him call Max Green at 6:00. It's important. Question: Who is the caller? - John Smith. - Max Thomas. - Max Green.
A:
Max Green.