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.
Q: Sentence1: Sara was flying her kite. Sentence2: She went to close to a tree. Sentence3: The kite got tangled in the tree's branches. Sentence4: Sara asked her dad for help. Sentence5: Sara's dad was able to untangle the kite from the branches.
A:
Sara's dad, Sara