When does the conversation take place?

M: Hey, Ellen! How are you?
W: I’m fine, Bob. Aren’t you glad that the semester is over?
M: Yes! Are you going to the rock concert Friday night?
W: I hadn’t thought much about it. Are you?
M: Sure. Would you like to go with me?
W: Sounds like fun.
M: You’ll have to buy your own ticket though.
W: Are you broke again? Let me treat you.
M: Wow! When did you come into so much cash?
W: You know, I’m a waitress at the student center. Anyway now that final exams are almost over. I’d love a night out.
M: Since you’re being so great about buying the tickets, why don’t I take us out to dinner?