How To Write hello , how are you,bye, In Hindi?

Question

Answer

hello = Namastey! 
how are you? = aap kaise hai? / aap kaisi hai? / Tum kaise ho? / Tum kaisi ho? 
bye! = Alvida !

Answer

hello = नमस्ते ! Namastey! 
how are you? = आप कैसे हैं? aap kaise hai? 
आप कैसी हैं? aap kaisi hai? 
तुम कैसे हो? Tum kaise ho? 
तुम कैसी हो? Tum kaisi ho? 
bye! = अलविदा। ! Alvida !

Answer

Neha you would say, 'Namaste' (for Hello), "aap(You) kesse(How) hai(are)", "Namaskar(Bye)" in hindi. 
I am Rocky from india aand i am learning english.