A: You have to come back by four.
B: ____________________________.
OK. Okay, Okey, All right, Of course, Sure, Certainly, That's right, You're right, I see, Yes, I will.
(Can all the expressions above be the answers to the statement A? Do you have other suitable responses?)
I don't think I've ever heard "Okey" all alone = ham radio operators say "Okey dokey."
Otherwise everything looks good. Perhaps: Agreed, Absolutely, Indeed.
Sra