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: Max decided to attend a cooking class. Sentence2: He paid the registration fee online. Sentence3: Max went to the class on the assigned date. Sentence4: He learned to cook a casserole and pie! Sentence5: He cooked for his girlfriend the next week.
Max, His girlfriend, Cooking class