Task: Story Composition
Input (English): Premise: Ed was trying to board a plane. 
 Initial Context: But security stopped him. 
 Original Ending: They searched him and found his pocketknife! Ed had forgotten to leave it at home! Security threatened to arrest Ed. 
 Counterfactual Context: But security let him in.
Output (English): They searched him and found nothing in his pockets. Ed had left his pocketknife at home. Security had no reason to arrest Ed.