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?