Problem: Given the question: M: Actually, you've ordered too much. We can't finish it all. W: Never mind. This dinner is on me. What was said before this conversation?
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The answer is:
W: I'm so happy that you enjoyed the food.

Problem: Given the question: M: Walk along this road, and take the second turning on the left. You can see it. What was said before this conversation?
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The answer is:
W: Where's the hospital? My grandma is in the hospital.

Problem: Given the question: M: Urn... I'm busy myself in the business. But I can spare a little time. What was said before this conversation?
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The answer is:
W: The teacher Mr. Chen wants to talk with us about Jack's study. Are you free tomorrow?