In this task, you're given a four sentences of story written in natural language. Your job is to complete end part of the story by predicting appropriate last sentence which is coherent with the given sentences.

Sentence1: Jack went to the pet store after school. Sentence2: He fell in love with a white Labrador retriever in the window. Sentence3: Jack ran home and told his dad all about the puppy. Sentence4: His dad told him that he couldn't get the puppy.
Jack was so sad he cried himself to sleep.