How can i get Face time application for my iphone 6? I didn't found in iTunes store also. Please suggest me how can i get it.

Where possible, FaceTime will be part of the OS.

iPhones originating from Saudi Arabia or the United Arab Emirates will never have it.

iPhones originating from a different Middle Eastern country may lose it if unlocked or exported.

Otherwise, check the device’s restrictions.

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Also, just to verify that it may be on the iPhone but hidden somewhere in another folder, use Spotlight Search (pull down on any home screen) and type FaceTime. If it's on your iPhone it will show the icon and list which folder it's located in.