Task: Story Composition
Input (English): Premise: I have an old dog. 
 Initial Context: His hips hurt, so he can't do much. 
 Original Ending: I want to have an active dog. One that I can take on hikes with me. I think I need to get a new puppy. 
 Counterfactual Context: My dog's hips hurt him too much, so I decided to put him down.
Output (English): I want to have an active dog. One that I can take on hikes with me. I'm going to get a new puppy.