for hello,its 'namaskara' for how are you,its 'hegiddiya'( south karnataka) and its 'henga iddi'(north karnataka) (its similar in most of cities of karnataka but there are a few changes here and there) for i am fine, its 'chennagiddene' or 'aarama iddeni'

Hello (formal)- namaskara informal- Hi! How are you(formal)-hegidiri how are you (informal)-hegiddiya I am fine- chennagiddene