The passenger roster shows, but Tidus figures they might as well try this name thing first, so he taps out of it on the screen, searches for a particular section and brings up a a different one, with a keyboard function showing.

"...I don't know if this is gonna work," he warns, just so the guy knows, but then goes to type in a few words, before backing off again. "Just press the letters on the screen, there-" gesturing to the keyboard. "It'll make it appear where the other text is."

That text being:

change my name to