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: Don showed up for his clarinet lesson. Sentence2: He forgot to bring his music. Sentence3: A teacher told him to play some scales. Sentence4: Don really was not ready for that. Sentence5: After that they played some duets with teacher.

SOLUTION: Don, Teacher

PROBLEM: Sentence1: Steve was very nervous to ask Tina out on a date. Sentence2: Steve had liked Tina for months now, but they never really spoke. Sentence3: Steve got encouragement from his friends to ask her to hang out. Sentence4: Steve gathered courage and asked Tina to study together that night. Sentence5: Tina said yes and soon they started dating each other!

SOLUTION: Steve, Friends, Tina

PROBLEM: Sentence1: Bob loved to eat fat. Sentence2: His friends thought he ate too much. Sentence3: Indeed, the fat increased Bob's cholesterol intake dramatically. Sentence4: Bob's arteries were becoming clogged. Sentence5: After many years, Bob had a heart attack and died.

SOLUTION:
Friends, Bob