Sorry for waiting me on last Tuesday.

Hello, teacher K!

I am always happy to see you.
I am sorry for waiting me on last Tuesday.
Suddenly I noticed that my colleague's off and I needed to cover her, I had no time to cancel our class.
I had no time to tell you my apology during our class today. I was excited to talk with you about work environment.
Thank you, as always, for your wonderful teaching.
Have a great day, and see you tomorrow!

Y

Hello Yong!

Thanks for reaching out to me and sharing your reason. I believe you have mentioned it in class already about why you weren't able to join the class. Nonetheless, I appreciate your effort to send me a message just to send your apology. 
 

I also really enjoy our class because we have some great topics every time. I'll see you tomorro then. 

- K