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:       Do you surf online regularly , Joe ?  
 Person2:Of course . I stay online for four hours at least every day .  
 Person1:        Are you crazy ? What are you doing four hours online ?  
 Person2:Millions of things . I surf the Net , check my e-mail , and most importantly , I chat with my friends .  
 Person1:        Online chat ? Aren't you afraid of meeting bad people who pretend to be what they are not ?  
 Person2:No , I am not . And I love to meet new people in the chat rooms who share a lot in common with me .  
 Person1:        It sounds interesting . 

informal