What is the probable relationship between the speakers?

M: Hi, Sara. How’s your speech for Professor Grey’s class next Monday?
W: Actually, I’m a bit worried.
M: Why should you? What’s going on?
W: You know...what I chose to talk about is British history.
M: Really? That is a big topic.
W: Yes. There are so many things to cover. I just can’t see how to do it in a three-minute speech.