i am unable to connect my apple watch to my new iphone 11

I WAS USING APPLE WATCH ON IPHONE 7+ AND NOW I HAVE UPGRADED TO IPHONE 11 BUT WHEN I AM TRYING TO PAIR MY WATCH TO MY NEW PHONE IT IS NOT GETTING PAIRED.

I HAVE TRIED RESET WATCH BUT NO SUCCESS YET.

BUT IT IS STILL GETTING CONNECTED TO MY OLD PHONE.

KINDLY PROVIDE ME A SOLUTION FOR THIS.

AS I HAVE BEEN TRING TO DO THIS PAST 2 DAYS.