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 a problem with my credit card .  
 Person2:What's wrong with it ?  
 Person1:        There is a charge on my card that I didn't make .  
 Person2:Can you tell me what the charge was ?  
 Person1:        It's for a purse that cost $ 350 .  
 Person2:Are you positive that you didn't buy the purse ?  
 Person1:        I can't even afford a purse that expensive .  
 Person2:I'm very sorry . When was this purchase made ?  
 Person1:        I was at work , but the purchase was made at 3  
 Person2:We're going to investigate this claim .  
 Person1:        OK.Do I have to pay for this charge ?  
 Person2:You won't have to pay for anything . 

formal