While Luke didn't mind answering that kind of question to people like Celia, he didn't want to say it when he was around strangers. He also wanted to warn her to keep that information hidden from others. Knowledge is power, after all. Besides, a mystery brings doubt, and doubt brings fear. He would use both to make people think twice before picking a fight with him, or at least get in their heads and make them hesitate when it starts…
"Okay… it is fun to ride on one of those?" Celia asked. What is the name, by the way?"
"Artiuno, and I guess it is," Luke said. "You just need to be wary of her cold body and the aura that she emits. You will get frostbites if you aren't wearing decent clothes and have Cold Resistance as well."