conversations.from: human
conversations.value: This math problem has got me stumped: James has 20 friends. Yesterday at work he got into an argument with 2 of his friends. Now he no longer considers them as friends. On his way back home, he made one more friend. So how many friends does James have left?
  Can you show me the way?
conversations.from: assistant
conversations.value: James lost 2 friends, so he has 20 - 2 = 18 friends left.
  Then he made 1 friend, James now has 18 + 1 = 19 friends.