Is it normal referring someone you don't know by name as sir or madam is polite?
Recently, there was a story in the news about a child being expelled for calling an adult in school ma'am. I am sorry people but from childhood in Generation X and before, we call people sir or ma'am or learn their name. Punishing a child for being polite is nonsense. I have even had people yell at me saying, "Don't call me sir/Ma'am."