Yamato isn't visible as they approach, being in the cockpit with his head down as he familiarises himself with some of the wiring beneath the console, but he does pop his head up when hears Cassian.

"The engineers, right," he says, and hops out of the cockpit, sliding down the ladder. "Hey. Enjoying the convention? They have -- they have ships. Lots of ships."

The grin he flashes may suggest that he's been quietly geeking out over all the ships.