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:       Hi , Is that David ?  
 Person2:Hi , Jenny . It's David here .  
 Person1:        Hey , what's new ?  
 Person2:Not much . My girlfriend just dumped me .  
 Person1:        Sorry to hear that . What happened ?  
 Person2:Well , she told me things just weren ’ t working out and we weren ’ t right together . But I thought things were just great . Why did she say this ? It's completely out of the blue .  
 Person1:        Hey , that ’ s not the girl with pink hair , is it ? The girl I saw with Jack yesterday .  
 Person2:What ? She was cheating on me with that ugly guy . Oh , no , I feel like such a loser .  
 Person1:        Hey , she is not worth it . Forget her .  
 Person2:But she lied to me .  
 Person1:        Hey , she is not worth it . Anyway , there are plenty more fish in the sea . Listen , let's go for a drink in the town . How about that ?  
 Person2:Ok , then .  
 Person1:        But you have to promise me that you are not gonna wear that face .  
 Person2:What face ?  
 Person1:        The one where you look like your dog just died . You have to get over her and the sooner the better .  
 Person2:Yeah , I know . You are right . 

informal