@bindukumari1990
It's hard to give specifics without knowing how the page is built, but at a high level, I would assume there's a form submit event when the customer submits a pincode. When that happens, you could trigger an s.tl() (link tracking) call with the necessary information. (I'd capture the pincode and a success event, at a minimum.)
When the results come back from the server, I would send another s.tl() call (pincode, success event, and result). This, of course, assumes the customer remains on the same page, and that the information is returned dynamically. How you monitor for the information may vary based on how your page is set up... Are you using an event-driven data layer? Does the information get written to a JS variable or cookie? Can you monitor for changes to the DOM (mutationObserver)?