Your vitriol could be put to better use, kind sir.

"Excuse me, kind sir, but might I humbly ask you the name of this planet on whose soil we stand?"

"Thank you, kind sir," Barbara said to the movie star.

Then, kind sirs, you can open your museum to the public again.

But, touching your medicine, kind sir, in my present frame of body, I need it not.

I think they attack their own kind, too, sir.

"There is no need, kind sir, although you are most gracious to offer."

Betty is somewhat more insistent in telling him "Nothing today, kind sir".

"Thank you, kind sir," she said, mock amazement on her face.

"Please, kind sir, accept this dime and play your drum some other time."