Task: Story Composition
Input (English): Premise: Mia wanted to go sledding. 
 Initial Context: She called up her friends. 
 Original Ending: They said it sounded like fun! They all met at the hill in town. They spent the whole day sledding and laughing! 
 Counterfactual Context: She called up her sister.
Output (English): She said it sounded like fun! They met at the hill in town. They spent the whole day sledding and laughing!