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:       You ’ re home late today , David . How was school ?  
 Person2:Not bad . There ’ s a new English teacher .  
 Person1:        Oh , what ’ s she like ?  
 Person2:She is beautiful .  
 Person1:        Is she old or young ?  
 Person2:She is quite young and her hair is blond .  
 Person1:        Is she strict ?  
 Person2:Not really . Her eyes are blue .  
 Person1:        Can she speak Chinese ?  
 Person2:Not much . She is very tall and slim .  
 Person1:        David , stop dreaming . It ’ s time to do your homework . 

formal