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:       Is this your new teacher ?  
 Person2:Yes , it is .  
 Person1:        Is she short ?  
 Person2:No , she ’ s average .  
 Person1:        What color are her eyes ?  
 Person2:They ’ re dark gray .  
 Person1:        What color is her hair ?  
 Person2:It ’ s blond .  
 Person1:        And how old is she ?  
 Person2:I don ’ t know . 

formal