Definition: 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.
Input: Sentence1: Billy went to the hardware store with his father. Sentence2: Billy stopped to look at something. Sentence3: His father did not notice and kept walking. Sentence4: Billy looked up and his father was gone!

Billy found an employee who called his father for him.