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:       Did you hear about Joe ? She hasn't eaten for days .  
 Person2:Why ? What's eating her ?  
 Person1:        Love sick . You know who she's in love with ?  
 Person2:I don't have the slightest idea .  
 Person1:        Someone you're living with .  
 Person2:What ? Not my Dad , I hope ! ?  
 Person1:        Come on , Mary , it's your brother , Jack .  
 Person2:No kidding ! Jack is such a log ! He's never dated a girl .  
 Person1:        The problem with Joe is that she's too shy to tell him .  
 Person2:And the problem with Jack is that he seems to have no interest in girls . He's putting his heart into his stamp collection .  
 Person1:        Well , if you want to help your friend , you should do something about it . 

informal