Given the task definition and input, reply with output. 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: Johnny was excited to go the the flea market with his mom. Sentence2: When they got there they went from table to table. Sentence3: He finally asked his mother when they were going to see the fleas. Sentence4: She laughed, telling him there weren't actually fleas at flea markets.
He was extremely disappointed.