How do I write a composition about my talk with my teacher?

Teacher Du, I have many, many things to say to you, because I am too timid to say them to you. Today, I still mustered up the courage to tell you.

I remember one time, when my grandfather sent me to school, I met you, Teacher Du, at the school gate. I hurriedly said to you: "Hello, Teacher Du!" You replied with a smile: "Hello! Zhang Jiawei is so polite." I felt happy after hearing your praise.