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:       Julia , what do you think of the network ?  
 Person2:Network is omnipresent nowadays . It's quite convenient for people . You see , we can download music and information from the Internet ; I can study from it , too . And the most of all , we can compose , send , and receive e-mails .  
 Person1:        Yeah , you are right . Internet makes our lives easier . But it's a two-blade sword .  
 Person2:What do you mean ?  
 Person1:        I mean Internet brings benefit a lot , but also some disadvantages . For example , many youngsters are addicted to the games and they neglect their study ; or some bad guys steal people's money online , etc .  
 Person2:I agree . But I think although it has some negative effects , on the whole Internet does more good to us than harm .  
 Person1:        Yeah , you are right . But we have to know how to make good use of it . 

formal