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 introverted or extroverted ?  
 Person2:I wouldn't call myself introverted . Sometimes I enjoy being by myself very much . But other times I like sharing activities with others too .  
 Person1:        What kind of personality do you think you have ?  
 Person2:Well , I approach things very enthusiastically , I think , and I don ’ t like to leave something half-done . It makes me nervous . I can ’ t concentrate on something else until the first thing is finished .  
 Person1:        What do you think is the most important thing for you to be happy ?  
 Person2:For me , this would be having good relationships with my family members . My family has always been very close knit , and we still spend a lot of time together .  
 Person1:        What basic principles do you apply to your life ?  
 Person2:Working hard and being frugal are both virtues . I strive to practise these two virtues in my life . 

formal