Apa itu how are you dan percakapan antara guru dan murid tidak panjang dan tdk pendek

How are you = apa kabarmu?
guru: hi ! lia how are you today ?
lia: i'm fine, and you?
guru: i'm verry well. how do you do
lia: how do you do, i'm sorry miss, i verry busy now, can i go and next time we talk yet, bye
guru: i'm sorry disturb your time, bye