Hi" is fine if you don't know what to say. I'm not one of these pretentious pricks asking you to write a novel for me to answer.
Why do people ask me my name and where I'm from? It's on my profile by default. Reaaad.
Since a lot of people ask me that, I wanna go to a preparatory class after high school to study maths, physics and industrial science to try and get into an engineering school.