Are you Chinese?

Two passengers are travelling in a train and sitting opposite each other. One of them is a Sardarji. Here goes the conversation:

Passenger to Sardar: Excuse me Sir, are you Chinese?
Sardar (a bit surprised): No

Passenger (after 15 min): Sir, you are Chinese, na?
Sardar (bewildered): No, I’m not Chinese my friend

Passenger (aft another 15 min): Sir, something tells me you are Chinese
Sardar (angrily): Didn’t I tell you I’m not Chinese?

Passenger (aft yet another 15 min): I’m sure you are Chinese, Sir!
Sardar (up on his feet responds angrily and emphatically): Yes, I am Chinese…..I am Chinese....I am Chinese

Passenger: Really? I can’t believe it. You don’t look one bit Chinese….!