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:       Oh , sir . I lost my passport . 
 Person2:Do you remember when and where you last saw it ? 
 Person1:        I remember I saw when I was dining in the Aidan Restaurant . When I paid the bill , I saw it in my handbag . 
 Person2:Could you please tell me your passport number ? 
 Person1:        3448-2691- 6429-34 . 
 Person2:And what is the expiration date on your passport ? 
 Person1:        Five months later . 
 Person2:I see . Please fill out this form . And you need to contact your embassy or consulate to report it as soon as possible . 

informal