Teacher: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.
Teacher: Now, understand the problem? Solve this instance: Sentence1: May owned a house and rented a room to a student name Charles. Sentence2: Every year, in December, May took a flight to Japan. Sentence3: This year, on her flight, her flight attendant looked familiar to her. Sentence4: May asked the flight attendant did they know each other? Sentence5: The flight attendant was Charles' mother!
Student:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
May, Charles, Flight attendant, Charles' mother