Task: Story Composition
Input (English): Premise: Lew is so happy today. 
 Initial Context: His dad is taking him camping. 
 Original Ending: His dad is packing the tent in the truck. Lew is helping his dad. Soon they arrive at the campsite. 
 Counterfactual Context: His sister is taking him camping.
Output (English): His sister is packing the tent in the truck. Lew is helping her. Soon they arrive at the campsite.