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: The waiter came in the kitchen to talk to the chef. Sentence2: The waiter explained his guest had an allergy to cheese. Sentence3: The chef said that there was not any cheese in any dish. Sentence4: The waiter felt silly for not knowing this. Sentence5: The chef laughed at the waiter for being such a fool.
Waiter, Chef, Guest