What is the most probable relationship between the woman and the man?

M: Sorry I did not come yesterday, because I had a fever. Could you tell me the requirement for my term paper?
W: The theme of your paper can be about business management or touring resources in China, and the length of the paper should be no less than ten pages.

M: What’s all that noise? It sounds as if it’s coming from next door. The Johnsons aren’t back yet, are they?
W: I don’t think so. It must be the window-cleaner working upstairs.