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:       I want to open an account .  
 Person2:What kind of account do you want to open ?  
 Person1:        I want to open a checking account .  
 Person2:Do you know the minimum balance you ’ re required to keep ?  
 Person1:        How much is that ?  
 Person2:You have to maintain a minimum balance of $ 100 .  
 Person1:        Really ?  
 Person2:Yes , really .  
 Person1:        What if I can ’ t meet that requirement ?  
 Person2:You will be fined .  
 Person1:        How much is the fine ?  
 Person2:It ’ s going to cost you $ 25 . 

informal