Task: Story Composition
Input (English): Premise: Matt wanted to go back in time. 
 Initial Context: He went to the library to look up books about time travel. 
 Original Ending: He read all the books he could find. Then he decided to create his own time machine. He never succeeded because time travel is probably impossible. 
 Counterfactual Context: He went to the store to buy all the movies about time travel.
Output (English): He watched all the movies he could find. Then he decided to create his own time machine. He never succeeded because time travel is probably impossible.