saya mau tanya contoh perckapan dari your partner looks so fresh and happy when he/she shows up at the classroom??

A = Why did u look so sad B?
B = Nothing,its just..
(Then C come to the classroom)
B = Hello C (Start to smileing)
C = Hello! how are you
B = im fine thanks
(Then C leave)
A = why did u look so happy when u saw her?
B = it's not you bussiness.