Please answer this: M: No, it isn't mine. It's Sam's. What was said before this conversation?
++++++++
Answer: W: Is this your book, Mike?

Please answer this: M: Oh, I don't know. But you can try this phone number. What was said before this conversation?
++++++++
Answer: F: Hi, John. Do you know where to find Bob?

Please answer this: W: Oh, dear. John always does my hair. What was said before this conversation?
++++++++
Answer:
M: I'm afraid John's busy at the moment, madam.