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:       Not a single email until now ? it's already twelve o'clock . I can't believe it !  
 Person2:Can't bear it , right ? I've been there before . I'll feel uncomfortable if no one calls me or sends me text messages , like there is something missing .  
 Person1:        Yeah , that's right . If no one sends me text messages , I'll go crazy .  
 Person2:Actually , this is a kind of addiction called ' infomania ' or ' information overload ' .  
 Person1:        Addiction ? checking emails and text messages often can be called an addiction ? no way !  
 Person2:Yes , it is . Do you consider a frequent check of your in-coming emails to be an integral part of your working day ?  
 Person1:        Absolutely .  
 Person2:Do you have your cell phone with you wherever you go and check text messages and phone calls from time to time ?  
 Person1:        Yeah , it's a must . Otherwise , I may miss important phone calls and text messages .  
 Person2:Do you open all your IM tools whenever you're using a computer ?  
 Person1:        Yes . MSN , QQ , Skype , Google Talk , Ali wangwang , everything , so that I'll be in touch with all friends and relatives .  
 Person2:Now I can tell you're definitely addicted to the overflow of information 

informal