conversations.from: human
conversations.value: John goes to the store to buy Slurpees and gives them $20.  Slurpees cost $2 each and he got $8 in change.  How many Slurpees did he buy?
  Can you solve this problem?
conversations.from: assistant
conversations.value: He spent 20-8=$12 on Slurpees
  So he got 12/2=6 Slurpees