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 need to open an account .  
 Person2:Do you know what kind you want to open ?  
 Person1:        I want a checking account .  
 Person2:Do you know what the minimum balance is ?  
 Person1:        What is that ?  
 Person2:You need to keep it at $ 100 .  
 Person1:        That ’ s it ?  
 Person2:That ’ s the least amount you can have .  
 Person1:        What ’ ll happen if I don ’ t maintain that ?  
 Person2:We will fine you .  
 Person1:        How much will I be fined ?  
 Person2:You will be fined $ 25 . 

formal