No, I- Well... [Luke frowns, surprised by the sudden turn. He's realized too late this is a subject that requires more sensitivity than he's given it, and finds himself suddenly out of his depth. He wasn't thinking, but, he realizes, wasn't that the whole problem? He wasn't thinking at all.]

[He takes a step back, and looks upward, thinking. Miles is a man deserving of a thoughtful answer, so Luke takes a moment to drudge one up. Words have never been his element, much less coming up with the right ones at a second's notice.]

I guess, I... didn't think anything at all. [Which is a weak answer, he knows, but it's the deserved truth.] Tatooine is a trading hub at the best of times; the people who come by are too varied for me to really know everything about them. You spoke Basic, so I didn't really think about it until we got here. [Whatever Miles was or wasn't, he'd assumed it was the norm for his planet.]

[More fool him.] I'm sorry. I shouldn't have assumed.