नमसते, आप कैसे है?
Nuh-muh-stay, aap kay-se hai?
"Hello, how are you?"
Conversationally, I was told it's
और कैसे चल रहा है?
Aur kay-se chal rahaa hai?
"...and how's it going?"
और कया नाय चल रहा है?
Aur kya nai-a chal rahaa hai?
"...and what new is going on?"
Google says...
हैलो, कैसे हो?
Hay-lo, kay-se ho?
"Hello, how are (you)?"
(You wouldn't believe how long it took me to type this)
Hopefully, if this is wrong, someone can correct.
Correction: based on the way I was pseudo-spelling things, it should read "hay" instead of "hai"
check out this video, its gonna help you alot in leaning hindi
https://www.youtube.com/watch?v=cxFiXA-Q0F0
Correction 2: नई is correct spelling for 'new' (nai)