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: Chad was experiencing a very bad toothache. Sentence2: Chad decided it was time to see the dentist. Sentence3: At the dentist office, he gave Chad some bad news. Sentence4: Chad would have to get his tooth pulled. Sentence5: Chad was upset that he would have to get the tooth pulled.
Dentist, Chad