Who is Janet?

M:   Biology department,   Webster speaking.
W: Hello Professor Webster. This is Janet Hill calling. I live two doors down from Professor Don Williams.   Don asked me to call you,   because he has got a terrible cold and lost his voice.
M:   Lost his voice? Oh,   I’m sorry to hear that.   Is there anything I can do for him?
W:  Well,  he has a class this afternoon from 2’- 30 to 4:00,  and he won’t be able to teach it.
M:   Does he want me to try to find somebody else to teach the class?
W: No, not exactly. What he wants to do is to get someone to go in for him, just to pass back the mid-term exam papers.
M: His class is at 2-30, you say? Well, I’m free at that time and I could do it for him. What room is his class in?
W:  Carter Hall,  Room 214.  You can get the papers in his office.
M:  OK,  that’s fine.
W:   Thank you very much,   Professor Webster.
M:   That’s all right.   Thank you,   and hope Don will get better soon.