Can you understand what O.C. means:

Hello,

Thank you Mrs. Claire. This idea-strategy beautiful and i am think no
problem. I can...
Okay, i am will also do all the writings according to EU
rules. How many posters?...You are know..

Mr. Osman i am waiting. Thank you.

Thanks,

O.C.

The graphic designer had to write a reply to a team where one member did not know Turkish.  

He was happy with my proposal, confirms he can write texts correctly, and asks for us to decide on the number of posters.  He also reminds another person to do a task.