Given the task definition and input, reply with output. In this task, you're given a story (which contains five sentences only). Your task is to find all the characters which are available in the given story.

Sentence1: Jason was a lifeguard at the neighborhood swimming pool. Sentence2: Nothing interesting ever happened on Jason's shift. Sentence3: While sitting in his chair, Jason's mind began to wander. Sentence4: It wasn't long before he dozed off. Sentence5: Jason's supervisor woke him up and reprimanded him for sleeping.
His supervisor, Jason