Thank you for your wedding wishes. How to reply?

You can reply to your leader like this:

"Thank you for your blessings, I am deeply honored. On this special day, your blessing has undoubtedly added more color to my joy. I will cherish this feeling and hope that in the future, my other half and I can grow old together and create more beautiful memories together. Thanks again, I wish you good health and a successful career. "

This not only expresses gratitude, but also gives back blessings, which is an appropriate response to the leaders' good wishes.