"Passenger roster." Which is a list! A list that Tidus saw the names and faces of everyone yesterday, and then promptly forgot the number of multiples! "And, uh, you'd have to check it. There's - three three? Three Wangjis, three Wuxians?" An exasperated scoff. "I don't know, it's not my family! But- upper four, I think that's the cabin car. If you visit before we stop, you should get the room."

Because most likely, he wouldn't stay the sole guy in the room once they hit the platform.

"But if he doesn't know anything about it - how about ordering a book? If you're into reading - give ordering it a try! Like... 'void mind training'." Very good keywords. "Did they have a funny name for the exercise?"

That's also probably good to look up.