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:       Here ' s my passport . I'm a visiting scholar .  
 Person2:Do you have anything to declare ?  
 Person1:        No , these are all my personal effects .  
 Person2:What's in the bag ? Would you mind opening the bag ?  
 Person1:        Not at all . I don't know what's dutiable.Do I have to pay duty on things for my own use ?  
 Person2:No.You don't have to pay duty on personal belongings .  
 Person1:        Thank you . 

informal