I'm sorry but I don't understand. "sir" a gender address for male, and "miss" for female. We call our male teachers sir, female teachers miss. I heard this phrase used a lot by English speaking people.
Thank you for your insight. My last job I worked as a customer service representative would never allow us to just write, "Hi Clive", it had to be "Hi Mr. Clive". If it's a madam, we call her "Hi Ms. Kate". And every correspondent had be printed out and checked by him first before sending out. I think I'm just used to it. I won't call you sir, or madam to maybe AlpheccaStar