TASK DEFINITION: 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.
PROBLEM: Sentence1: Dan wanted to get some exercise in today. Sentence2: Dan decided he would go to the local pool and swim several laps. Sentence3: However, when Dan arrived he noticed the facility was closed. Sentence4: Dan decided he would go back home and exercise there. Sentence5: Dan was disappointed that he could not swim in the pool.

SOLUTION: Dan

PROBLEM: Sentence1: Jennifer wanted to organize her living room. Sentence2: She bought a tall bookshelf to contain the clutter. Sentence3: She put some cute knick knacks on it as well. Sentence4: Jennifer felt like her living room was really coming together. Sentence5: She liked having a clean, organized space!

SOLUTION: Jennifer

PROBLEM: Sentence1: I had a final exam. Sentence2: I decided to not go. Sentence3: My grade was high enough that I could skip the exam. Sentence4: Alas, I didn't read the syllabus correct. Sentence5: I failed the class because the final was worth more than I thought.

SOLUTION:
I (myself)