Task: Story Composition
Input (English): Premise: John went for a walk to get some fresh air. 
 Initial Context: He loved to walk in the woods. 
 Original Ending: Today there was a bike race on his favorite trail. He didn't realize it until a biker almost hit him! John walked back home, feeling defeated. 
 Counterfactual Context: He went and sat down by the river.
Output (English): Today there was a bike race on the river trail. He didn't realize it until a biker almost hit him! John walked back home, feeling lucky.