Task: Story Composition
Input (English): Premise: Sarah is having a birthday party this month. 
 Initial Context: She wanted to have a circus in her backyard. 
 Original Ending: Sarah's mother told her that a clown would be nice to have. Sarah hated clowns because they were scary. During her birthday, the clown made her feel happy many times. 
 New ending: Sarah's mother told her that a big pony would be nice to have. Sarah hated over-sized ponies because they were scary. During her birthday, the big pony made her feel happy many times. 
Output (English): She wanted to have a pony in her backyard.