mini conversation

so i was at school today for my group meeting and i bumped into one of our international student from Asia in the hallway. I had a mini-conversation with him and it went something like this:

Jack: How's your weekend going?
Int'l Student (IS): Oh, I'm good, thank you. [um, I asked about his weekend but watever]
Jack: Excited that school is almost over?
IS: Oh yes! I'm quite excited...after school is over, I plan to visit California! woohoo!
Jack: Oh cool, which part of California are you visiting? LA? San Francisco?
IS: No, Las Vegas!!!
Jack: .... ... ....
Jack: Great, have a nice trip!

I really wonder if a lot of people outside of the US think Las Vegas is in California?!?!