Siri gone

Go to Settings > Accessibility > Siri, then turn on Type to Siri. To type a request, activate Siri, then use the keyboard and text field to ask a question or make a request.

Use Siri on iPhone - Apple Support (IN)

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With the limited information that you have provided, It is hard to even guess the problems faced by you. 

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Please re-post with detail so that someone else can help.

Set up Siri to recognize your voice · Go to Settings. · Tap Siri & Search. · Turn off Listen for "Hey Siri," then turn it back on. · When the Set Up ...

If "Hey Siri" isn't working on your iPhone

Are you looking for an App called Siri? Then there is none.