We don't quite have contractions like that. You'd just use "hi los", just "hi", just "los", or nothing at all, since subjects, as well as forms of "to be" can be implied.

What I'm saying is that we don't need a word to contract "you are" because you can just leave it out and up to context.

There actually is a word that specifically means "you're," losei. It appears in only one line of dialogue; ful, losei dovahkiin "so, you're the Dragonborn."

As hiith mentioned, contractions can often be left to context. If you want to say "I'm the Dragonborn," you'd just say zu'u dovahkiin. "I don't know" would be ni mindok.

losei is the word but is not used a lot so I would use hi los

Who says losei?

http://youtu.be/QMQBQ9VAwGE?t=57s

Okay! So is that in the dictionary?