Task: Story Composition
Input (English): Premise: Billy has asked Santa for a sled for Christmas. 
 Initial Context: So he was really hoping it would be a white Christmas. 
 Original Ending: The weatherman was calling for snow when he went to bed. The next morning he woke up to snow on the ground. He had gotten his sled, too. 
 Counterfactual Context: so it seems that it is a white christmas.
Output (English): The weatherman was calling for snow when he went to bed. The next morning he woke up to snow on the ground. He had gotten his sled, too.