Task: Story Composition
Input (English): Premise: My dad died when I was 22 years old. 
 Initial Context: He had a heart attack unexpectedly. 
 Original Ending: He woke up with chest pain one morning. He went to the hospital to check it out. He never came back home. 
 Counterfactual Context: He had a brain aneurysm unexpectedly.
Output (English): He woke up with a headache one morning. He went to the hospital to check it out. He never came back home.