In Hindi there isn't a variety of greetings related to the time of the day, some greetings correspoding to 'Good morning', 'Good night' have been introduced but they are not very common in the spoken language. The most common way to greet someone is namaste, used both for 'hello' and 'good bye', in most cases it is followed by the respectful jii (jee) as in 'namaste ji', 'namaste Mohan ji'. The way to greet someone can also be chosen according to their religion, a Sikh would use sat siri akaal and a Muslim salaam alaikum. Namaste and namaskaar derive from Sanskrit and they literally mean 'honour to you', they are spoken with joined hands and gently bending the head in a slight bow.

Hello / Good Bye =>                            नमस्ते   namaste

Hello / Good Bye =>                           नमस्कार   namaskaar

How are you? (to a male) =>              (आप) कैसे हैं?   (aap) kaise hain?

How are you? (to a female) =>           (आप) कैसी हैं?  (aap) kaisi hain?

I'm fine =>                                         (मैं) ठीक हूं  (main) theek hoon 

See you / Bye =>                               फिर मिलेंगे  fir milenge