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.
Input: Sentence1: Sal and his wife flew to Hawaii for vacation. Sentence2: After their vacation they went back to the airport. Sentence3: The airline had overbooked the flight. Sentence4: They asked for volunteers to stay in Hawaii an extra day. Sentence5: Sal and his wife were happy to volunteer!
Output:
His wife, Sal, Hawaii, Airline, The airport, The flight