Detailed Instructions: 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: An old man walked with a cane. Sentence2: He started to fall on the ice. Sentence3: A person looking out for him saved him. Sentence4: The man was so thankful. Sentence5: The man bought the person a drink.
Solution:
Person, Old man