Task: Story Composition
Input (English): Premise: I used to play racketball with my friend at school. 
 Initial Context: We would rent out a court and meet up to play. 
 Original Ending: Man it was tiring! You would chase the ball all around the court. It probably was one of the best workouts I've ever gotten. 
 Counterfactual Context: The court we rent out was booked today.
Output (English): Man it was disappointing! We could have chased the ball all around the court. It probably would have been one of the best workouts I've ever gotten.