Task: Story Composition
Input (English): Premise: Sam's family decided they wanted to go on a family vacation. 
 Initial Context: Sam had never been on a plane before so he was very nervous. 
 Original Ending: He asked me for some tips on staying calm and so I told him some. He was very grateful but still extremely nervous. On his flight he was fine and thanked me so much when he got home! 
 Counterfactual Context: Sam had never been on a train before so he was very nervous.
Output (English): He asked me for some tips on staying calm and so I told him some He was very grateful but still extremely nervous. his train ride he was fine and thanked me so much when he got home