第一部分：表示祝賀

I was very happy to learn that …

I was very delighted to hear the news that…

It is with great pleasure that I hear of your success. Please accept my warmest/heartiest congratulations(最衷心的祝賀).

Allow me to convey my congratulations on your promotion to …

第二部分：表述賀喜內容

How time flies! Here you are graduating from high school and planning to attend the university in the fall. Congratulations on a job well done, and good luck to you during the next four years of university.

第三部分：表達美好祝愿

Wish you good luck!

I wish you success and fulfillment in the years ahead.

Happy New Year to you and may each succeeding year bring you greater happiness and prosperity.