Aurus let the question sit there for a solid five-count before answering, very flatly:

"I'm a sylvari."

He wasn't offended, nor honestly even terribly surprised--he hadn't stopped in Ebonhawke on his way south just like he presumed others of his kind also had not, if they'd ever even traveled this way (it was not a foregone conclusion). So he could easily believe that this boy had never seen a member of his race before, but he still wasn't going to just offer any elaboration. If Hakkyuu wanted that, he would have to request it specifically.