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:       Could I have my hair dyed ?  
 Person2:Certainly , which color do you want to dye it ?  
 Person1:        I want the latest fashion , can you make some suggestions ?  
 Person2:Right now , many girls are dyeing there hair blond .  
 Person1:        I don't think that was suit me very well , blond is kind of erratic .  
 Person2:What do you think about pink ?  
 Person1:        Oh , no . I think it's better to be a natural chinese , with natural chinese hair.Have you got good brand of hair dye ?  
 Person2:Yes , we have several brands , which one do you prefer ?  
 Person1:        I want the best one .  
 Person2:First , you need a shampoo , it makes it easier for your hair to be dyed . Let's down your hair in the water , you hair will be fairly clean that way .  
 Person1:        After this dye job , it feels I look younger .  
 Person2:You hair is definitely fresh and shiner looking . 

formal