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:       Did you see the fashion awards last night ? 
 Person2:I sat through about half of it but they lost me after that . 
 Person1:        Not interested ? 
 Person2:Not really , to be honest . Some of what they call fashion looks terrible to me . 
 Person1:        But they are showing what will be all the rage next year . 
 Person2:All the rage with whom ? I never see anyone wearing these designs on the street . 
 Person1:        Did you know that fashion is cyclical ? 
 Person2:What , it keeps coming back ? 
 Person1:        Precisely ! For example , Flares were popular for a while , then went out of fashion . Now we can start to see them coming back in again . 
 Person2:Flares ? 
 Person1:        They're also known as bell-bottoms . They are a type of trousers . 
 Person2:It's too complicated . I'll just stick to the plain clothes . 
 Person1:        That's fine , but then you'll always look plain . 

formal