Good Day-Shubh din (Shubh-good, din-day)
Have a nice day is not really used... Atleast I havent heard anyone use it despite my 7 year stay in North India(Orissa)
Is this final price- Yeh aapka akhri dam hai? (Yeh-This, aapka-your, akhri-final, dam-price)
Where is- Kahan hai? (kahan-where)
Where is central park? Central park kahan hai
Hope this helps you :)