No we won't. Not unless we don't speak English.
"Hello."
An Indian isn't going to bother greeting a white person in his native language unless he doesn't speak English.
Especially if you're meeting a potential boss, and it's a white person, you're going to act white.
I suppose there is a possible exception for when you want to seem "more native." It could be useful if you're selling native jewelry, or giving an intro/talk/explanation at cultural event or cultural center. If the fact that you're native is a primary reason for the conversation, then I suppose you might.
ETA: Alternatively, you could always go with "Greetings, Pale Face."
All of this. ^
The majority of American Indians today don't even know their aboriginal language, much less speak it to people outside the culture. I assumed from your question that your story was set in a much earlier era.
The only ones I have ever met that weren't fluent in English were a handful of
really old Navajo and Tohono O'odham. And even then, they knew enough English to have the lyrics of many Beatles songs memorized. UMC in Tucson does have interpreters on hand for folks like them when they come in, but it's extremely uncommon, and unlikely they'd be looking for a job at their age (think 90+).
Other than that, I do know people who speak Chinook jargon. But that's a trade language with just bits of Salish woven in, it's not a primary language, and they only speak it to each other. Definitely not to potential employers unless they're interviewing for a position at a living history museum.
