What about
:
Yes Sir / Ma'am
No Sir / Ma'am
Please
Thank you
I'm sorry
My fault
You made you bed, now sleep in it
Hello
Hello, you have reached the ______ residence, this is _______ speaking...How may I help you?
Can I help?
(General population, not kids raised by good parents)
Big problem I had as a Lieutenant, was learning to answer Yes Sergeant to my Platoon Sergeant instead of Yes Sir. I blame my parents for that fault

I have even been known to slip and call SOGVET "Sir" (I think it just makes him feel old though

)
V/R,