Task: Story Composition
Input (English): Premise: Tammy played with her dog in the park. 
 Initial Context: They played fetch. 
 Original Ending: Tammy threw the ball and the dog ran fast. Tammy didn't know where her dog went. Fortunately, she followed the dog's footprints to where it was. 
 New ending: Tammy threw the ball and both dogs ran fast. Tammy didn't know where the dogs went. Fortunately, she followed the dogs footprints to where they were. 
Output (English): They chased each other and her dog met a new friend.