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:       How do you usually part your hair ?  
 Person2:To the right .  
 Person1:        ( The hair stylist cuts the customer's hair . ) Almost done . I just have to even things up a bit . ( She shows the customer the results . ) Will that do ?  
 Person2:Looks good .  
 Person1:        Would you like a shave ?  
 Person2:No , thanks .  
 Person1:        Okay , let me brush you off . Thank you very much for coming .  
 Person2:Thank you . 

informal