'Sir' in the Bible

Then I asked, "Who are these, sir?" The messenger who was talking to me answered, "I will tell you who these are."

Then I asked the angel who had been speaking with me, "Sir, what are these?"

The angel who had been speaking with me answered by asking, "You don't know what these mean, do you?" So I responded, "No, sir."

The angel replied, "You don't know what these are, do you?" I responded to him, "No, sir."

In response, I asked the angel who had been talking with me, "Sir, what are these?"