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 morning , Sir . Can I help you with something ?  
 Person2:I hope so . I'm not actually a customer here , but I saw an advertisement in yesterday's newspaper about your new bank card .  
 Person1:        I see . Yes , the advertisement has proven very effective . Would you like to apply for a card with us ?  
 Person2:Yes , please . But I suppose I'll have to open an account with you first , right ?  
 Person1:        That's right . But don't worry ; it's a very simple procedure .  
 Person2:Could I open an account with you today ?  
 Person1:        Of course , it can be done right this minute . If you could just fill in this application form for me ? Do you have your ID card with you ? I'll need to see that .  
 Person2:Yes , here you go . And sign here ?  
 Person1:        Yes , please . That's being processed now . As soon as the account is set up , we can issue you with a card .  
 Person2:So quick and easy ! Thanks very much . 

informal