Hi saiganeshvs
Welcome to the Apple Community
You might want to try the steps in this article (link below) from Apple Support:
Learn what to do: If your left or right AirPod isn't working - Apple Support
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More info:
What to do: If your left or right AirPod isn't working - Apple Support
Control audio with your AirPods and AirPods Pro:
How to: Pause, skip, and adjust volume with your AirPods and AirPods Pro - Apple Support
What to do: If your AirPods won’t charge - Apple Support
Other resources:
AirPods Support Website:
Find all the topics, resources, and contact options you need for your AirPods....
AirPods Support - Official Apple Support
And
 AirPods User Guide
AirPods User Guide – Apple Support
All the best :-)