Siri is not responding to my voice and nit able to recognise my voice

Hi tanish162,

Welcome to the Apple Community.

Apple support have articles online (links below) to help with Siri.

If "Hey Siri" isn't working on your iPhone or iPad:

https://suppohttps://www.apple.com/siri/

       If Siri seems to hear you but not understand you,:

       make sure that your language and dialect are selected in Siri preferences.

       (Siri is not available in all languages, countries or regions.)

Change Siri settings on iPhone

https://support.apple.com/en-au/guide/iphone/iphc28624b81/ios

Siri Website

https://www.apple.com/siri/

Hope this helps you work with Siri :-)