I assumed that this was someone from my country as Sandy is a fairly common boy-name here. I replied - "Ok sir".
Then the proctor spoke and I was embarrassed to find out that it was a female proctor (probably American). I should've apologised (but I didn't... I was so anxious about the test that I forgot my manners π). She was very nice to me and very polite. Still I should've apologised π
How would you feel if someone addressed you like this? Also if you knew that the other person comes from a different part of the world with differing cultures.