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: Chris took his girl on a boat trip. Sentence2: They went to channel islands Park. Sentence3: The ferry ride was an hour. Sentence4: Along the way they saw blue whales. Sentence5: It was the most amazing boat ride.

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
Chris, Chris's girl