Problem: Given the question: W: From 10 to 4 o'clock, Monday through Thursday. On Fridays we're open until 5. We're closed on Saturdays and Sundays. What was said before this conversation?
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The answer is:
M: What are your banking hours?

Problem: Given the question: M: Yes, I want to buy a stamp for the letter. What was said before this conversation?
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The answer is:
F: Can I help you?

Problem: Given the question: M: I'm afraid not. I'll have a maths test tomorrow. What was said before this conversation?
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The answer is:
F: Will you be free this evening?