Task: Story Composition
Input (English): Premise: Nik wanted hot dogs for dinner. 
 Initial Context: But, he had no mustard. 
 Original Ending: It was snowing outside and there was a blizzard. Still, Nik braved the weather and went to the grocery store. He bought his mustard and had hot dogs for dinner. 
 Counterfactual Context: But, he had no ketchup.
Output (English): It was snowing outside and there was a blizzard. Still, Nik braved the weather and went to the grocery store. He bought his ketchup and had hot dogs for dinner.