Task: Story Composition
Input (English): Premise: Sam's dog Rex escaped from their yard. 
 Initial Context: Sam was distraught. 
 Original Ending: He went out calling for Rex. Then he saw Rex come running up the street! Sam was so relieved, he almost cried! 
 New ending: He was busy petting Rex. Then he saw another dog named Rex come running up the street! Sam was so confused, he almost cried! 
Output (English): Sam was very happy the dog came back.