conversations.from: human
conversations.value: John is a carpenter. For his friend Ali, he manufactured 4 wooden tables for $20 each and 2 roof frames for $10 each. How much does Ali have to pay John?
conversations.from: assistant
conversations.value: For the wooden table, Ali should pay: $20 * 4 = $80
  For the roof frames, Ali should pay: $10 * 2 = $20
  Combining the wooden table and the roof frames, Ali should pay: $20 + $80 = $100