conversations.from: human
conversations.value: Audrey was asleep for 10 hours last night and dreamed for 2/5 of the time. How much of the night was she not dreaming?
conversations.from: assistant
conversations.value: If Audrey was asleep for 10 hours last night and dreamed for 2/5 of the time, she dreamed for 2/5*10 = 4 hours.
  The total time Audrey slept without dreaming is 10-4 = 6 hours.