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:       Are you almost finished with my hair ?  
 Person2:I'm almost finished .  
 Person1:        How much longer is it going to be ?  
 Person2:I'm done now . Do you like it ?  
 Person1:        I absolutely love it .  
 Person2:You really like it ?  
 Person1:        Yes , I truly do .  
 Person2:I'm glad you like it .  
 Person1:        How much do I owe you ?  
 Person2:It's going to be $ 55 .  
 Person1:        Here you go , thanks for everything .  
 Person2:Make sure and come back in a couple of weeks . 

informal