Task: Story Composition
Input (English): Premise: Mandy warned her boyfriend, Dave, that she hated surprise parties. 
 Initial Context: Dave thought she was sending him a message in code. 
 Original Ending: He was confident she was hinting that she desired such a birthday. He went to great effort to throw her an elaborate surprise party. Initially angry, Mandy calmed down when she saw how hard he'd worked. 
 New ending: He was disappointed that she was hinting that she hated such a birthday. He had gone to effort to throw her an elaborate surprise party. Initially angry, Dave calmed down when he realized he had made an assumption about her. 
Output (English): Dave thought she was sending him a message in code and decided to cancel the party.