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:       What ?  
 Person2:What happened with that guy at the cafe ?  
 Person1:        nothing .  
 Person2:But you ’ re crazy about him .  
 Person1:        Yes , I am .  
 Person2:Why don ’ t you run off with him ? What are you waiting for ?  
 Person1:        I don ’ t actually know him .  
 Person2:Really ?  
 Person1:        I only know him through the ... you are not gonna believe this .  
 Person2:Oh , let me guess . Through the internet ?  
 Person1:        Yes .  
 Person2:Hmm . ' You ’ Ve got mail . ' 

informal