Task: Story Composition
Input (English): Premise: Mark wasn't sure what to get for his girlfriend Sara on her birthday. 
 Initial Context: Mark asked Sara's friends for recommendations. 
 Original Ending: They all said Sara likes panda bears. Mark booked a flight to China for Sara's birthday. Sara played with panda bear cubs in a Chinese zoo on her birthday! 
 Counterfactual Context: He decided to surprise her with a scavenger hunt.
Output (English): He knew that Sara likes panda bears. Mark booked a flight to China for Sara's birthday, and the scavenger hunt lead her to the tickets. Sara played with panda bear cubs in a Chinese zoo on her birthday!