conversations.from: human
conversations.value: Break down this math problem: John's weight bench can support 1000 pounds.  He wants to make sure to stay 20% under that weight for safety.  If he weighs 250 pounds how much weight can he put on the bar?
conversations.from: assistant
conversations.value: He wants to stay 1000*.2=200 pounds under the max
  So he wants to stay under 1000-200=800 pounds
  That means he can put 800-250=550 pounds on the bar