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 have to use the ATM .  
 Person2:Is there a problem ?  
 Person1:        I don ’ t know how to use it .  
 Person2:What are you talking about ?  
 Person1:        I have never used an ATM before .  
 Person2:I can show you how to use it .  
 Person1:        How do I use it ?  
 Person2:You need to push your card into the machine .  
 Person1:        What ’ s next ?  
 Person2:Enter your PIN .  
 Person1:        What else do I have to do ?  
 Person2:Every option you can choose will appear on the screen . That ’ s about it . 

formal