What is Mr. Carson doing when Mr. Prince calls him?

M: Good morning, Mr. Carson, please?
W: I’m afraid Mr. Carson is at a very, important meeting at the moment and cannot be disturbed. May I know who’s calling?
M: Yes, this is Mr. Prince. I would like to talk to Mr. Carson today, if possible.
W: Well, I’m afraid the meeting isn’t planned to finish until one o’clock and then he has a lunch appointment. If he has time, I can ask him to ring you before he leaves.
M: Yes, I’d be grateful if you would.
W: Not at all. Mr. Prince. Could I take your telephone number and then I’ll ask Mr. Carson to ring you as soon as he’s free.
M: Yes, it’s Hong Kong-68261427 extension 4036.
W: Hong Kong-68261427 extension 4036. Right. If Mr. Carson can’t ring you this morning, I’ll ask him to ring you as soon as he returns from lunch.
M: Thank you.