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: It was valentine's day. Sentence2: Jerry wanted to give something good to his girlfriend. Sentence3: He took her out on a date. Sentence4: She told him she's breaking up with him. Sentence5: This was his worst valentines ever.
His girlfriend, Jerry