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:       But Sue is indeed beaut . Men can hardly resist such a knock-out .  
 Person2:Birds of feather flock together . You must be one of these men .  
 Person1:        I know little of her . I only think she ’ s pretty and intelligent . Of course , she ’ s diligent , too .  
 Person2:That ’ s enough for you to worship the ground she treats on . 

informal