Q: 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: Dan was recently invited to participate in his high school reunion. Sentence2: Dan was nervous to meet his former high school classmates. Sentence3: In addition, Dan feared he would not notice anyone there. Sentence4: Dan felt it would be fun to see his classmates again. Sentence5: Dan decided to throw caution to the wind and attend the reunion.
A:
Dan, Classmates