conversations.from: human
conversations.value: Can you explain how to solve this math problem: Bret takes a 9 hour train ride to go to Boston.   He spends 2 hours reading a book, 1 hour to eat his dinner, and 3 hours watching movies on his computer.  How many hours does he have left to take a nap?
conversations.from: assistant
conversations.value: For all his activities on the train, Bret spends 2 + 1 + 3 = 6 hours.
  For his nap, he has 9 - 6 = 3 hours left.