Definition: You are given a conversation between two people. 'Person1:' and 'Person2:' are used to separate their respective dialogues. You are required to assign a label 'formal' if there is an absence of emotion and a presence of questions anywhere within the conversation. If such pattern is not found assign the label 'informal'.
Input:  Person1:       Good afternoon.Welcome to China.May I see your passport , customs and health declaration form ? 
 Person2:Yes , here you are . 
 Person1:        Thank you.What ' s your occupation , Mr . Smith ? 
 Person2:I'm the general manager of the Far-East Industry Corporation . 
 Person1:        You are here on business , aren't you ? 
 Person2:Yes , I have been invited by the East Import & Export Corporation of China for business talks . 
 Person1:        I see.Do you have anything to declare ? 
 Person2:Yes , I have some foreign currency to declare . 
 Person1:        Would you please fill out this currency declaration form ? It's a record of the foreign currency you have brough in . 
 Person2:All right . 

formal