"Tony" and "Anthony"

刚才看到一个电邮回信， 他说他叫“Anthony"， 不叫”Tony“。 唉， 他（华裔）已在这里工作了二十来年了， 我叫他Tony， 他这么给我回信。 

下面是我给他私下回邮：

Thank you very much for your help.

When I first arrived here to begin my Ph.D. program, I was a bit confused. My supervisor often mentioned a professor he knew well, Anthony Thompson. He sometimes referred to him as "Tony," and I didn't initially realize it was the same person. It took me a while to understand that "Tony" was simply a nickname for Anthony.