Why can’t the man contact Mr. Thomas himself?

W: Good morning, this is Longman Company, can I help you?
M: Yes, I’d like to speak to Mr. Thomas please.
W: Who’s speaking please?
M: This is Mr. Brown.
W: I’m sorry, but Mr. Thomas left the office a few minutes ago.
M: That’s bad. I’ve been trying to call him the last ten minutes but your line has been busy.
W: I’m sorry for that. We’ve got a hot line this morning.
M: Will he be back soon?
W: I’m afraid not, he’s gone for the rest of the day.
M: Is there anywhere I can reach him?
W: I don’t think so. He’s going out of the town on business.
M: Would you please give me his phone number so that I can contact him myself?
W: Let me see ... sorry, (I) Mr. Thomas hasn’t left any private contact information. May I take a message?
M: That’s fine. (2) I have a business appointment with him for tomorrow morning at 10: 00, but I’m afraid I can’t make it.
W: Would you care to make another appointment?
M: (2) (3) Unfortunately, I’m leaving town rather unexpectedly, and I may be away for several days.
W: I see. I can tell Mr. Thomas that you phoned.
M: Thank you very much.