Question 18 - 20 refer to following paragraph:

M: Hello, Sue! Have you reserved your hotel room for this weekend’s trade show in Toronto yet? I’m not sure whether I should stay for two or three nights
W: I reserved a room for three nights. I want to stay for the morning brunch on Sunday
M: That’s smart. I’ll call the hotel now to make the same reservation
W: You should contact them as soon as possible. When I spoke with the hotel manager today he said there were only a few rooms left
18. What does Sue suggest the man do?