I applied for cabin crew many years ago and fell at the first hurdle. Cabin crews main role is the safety and well being of the passenger, in my ignorance I answered the same as your opinion, customer service. I have friends who are cabin crew and as well as being fluent in other languages than English are also medically trained. The job is not as glamorous as people think, how many times do you want to go to New York, a girl I know sits in the hotel watching a film on an overnight stop as she's bored with going out.
You're right. Showing my ignorance there.