What are the speakers discussing?

M: Hi, Maria, what’s up?
W: Well, I have a paper due this coming Monday and I’m wondering if it’s possible to switch shifts so I can have the weekend free to finish my paper. I know you’ve got exams a couple of weeks from now, so I thought I could free up a weekend for you at that time.
M: That’s a tough one, Jane. I promised my folks to visit them this weekend and they’re really looking forward to seeing me. Have you checked with Martin? Perhaps he can help you out.
W: Yes, I did. He can’t do it either since he has an exam next week.
M: That’s too bad. Oh, I have an idea. I know Greg is looking for some part-time job. Maybe you can ask him for help.
W: Yeah, I almost forgot about him. He mentioned once he could do replacement work anytime, since he’s only taking one course this semester.
M: I’m sure Greg has lots of free time.
W: Great! Thanks. I’ll let you know what happens.
M: I hope you can get your work done on time.