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: Nolan had a bad tooth. Sentence2: But he refused to go to the dentist. Sentence3: As the pain was getting more intense every day, he had no choice. Sentence4: He called for an emergency appointment. Sentence5: When the tooth was out, Nolan was grateful to be pain-free.
Dentist, Nolan