conversations.from: human
conversations.value: John skateboarded for 10 miles and then walked another 4 miles to the park. He then skated all the way back home. How many miles has John skateboarded in total?
  Can you solve this problem?
conversations.from: assistant
conversations.value: John traveled 10 + 4 = 14 miles to the park.
  His round trip would take 14 x 2 = 28 miles.
  If you subtract the 4 miles he walked then John traveled 28 - 4 = 24 miles.