conversations.from: human
conversations.value: My dog was born when I was 15 years old. Two years from now, my dog will turn 4 years old. How old am I now?
  Solve it.
conversations.from: assistant
conversations.value: In 2 years, my dog will be 4 years old, so my dog is 4 - 2 = 2 years old now.
  So I am 15 + 2 = 17 years old now.