Which room did the man take finally? Why is Mr Mo unable to meet Mr Brown?

M: Is No. 2 meeting room available this afternoon?
F: Let me see... Mm... No, the Production Department will have a discussion at 2:30.
M: Then what about No. 5 meeting room? How big is it?
F: It can only hold 15 people.
M: Oh, that’s a bit too small. We have about 30 people.
F: I think No. 3 meeting room will be available at 3 this afternoon. Is that OK?
M: No problem. Thank you.

M: Mr Brown, I am Mark Chen, Mr Mo’s secretary. I’ve just come from him with a message that he won’t be able to see you this afternoon as he promised. He’s just been called away to an important business negotiation. He sends his apologies and will call you personally as soon as he is free.