What does the man ask the woman to do?

M: Hi, Susan. This is Mike. Listen, could you do me a huge favor?(62)
W: Well, I’ll try. What is it?
M: I have an appointment with a new client this afternoon, but I can’t make it. Could you do it for me?(62)Another important client has called me in for an emergency meeting.(63)I really have to be out of the office this afternoon, and I can’t get back here before 3:00 p.m.
W: Well, in that case, of course I’ll be happy to take over for you. Why don’t you drop by the office later so I can tell you how it went?(64)