Task: Story Composition
Input (English): Premise: William was a young boy on his way to school. 
 Initial Context: He walked to class and sat in his seat. 
 Original Ending: His teacher told them they will be having a surprise pizza party. William and his classmates went outside to play on the playground. When they came back inside, they had pizza and soda waiting for them. 
 Counterfactual Context: He walked to class but got lost.
Output (English): Yesterday his teacher told them they will be having a surprise pizza party. William was upset that his classmates went outside to play on the playground without him. He was sad that when they went back inside they would have pizza and soda waiting for them.