Why doesn’t Ashley give the man a call herself?

M: Physics Department,Doctor Benson speaking.
W: Hello,Prof.Benson,this is Natalie Kent calling,I’m living next door to your teaching assistant,Ashley Lake.Ashley asked me to call you because she has lost her voice and can’t talk to you herself.
M: Lost her voice?Oh,what a shame!Is there anything I can do for her?
W: Well,she has a class this morning from 10:00 to 11:00 and she won’t be able to teach it,but she doesn’t want to cancel it either.
M: Want me to try to find somebody else to teach the class?
W: No,not exactly.What she wants to do is to get someone just to pass back the mid-term exams.she’s already marked them and they are on the desk in her office.The whole thing wouldn’t take more than ten minutes.
M: Her class from 10:00,eh?Well I think at that time I was going to be on campus anyway；so I could do it for her.what room is her class in?
W: Wisdom Building.Room 301.Will you need her office key to get the exams?She’s given it to me and I could bring it to you.
M: Actually,that won’t be necessary.We have a master key in the physics department.So I can get into her office.
W: Thank you very much,Prof.Benson.Ashley doesn’t have another class to teach until Friday,and hopefully.she will be able to talk by then.She’ll call you as soon as she can.
M: Thanks for passing a11 the news about Ashley,and please tell her not to worry about anything.