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:       Fred , can you tell me how I can open my QQ Zone ?  
 Person2:Click your right key of mouse and choose QQ Zone .  
 Person1:        Well , I have to provide some of my information , right ?  
 Person2:Yep ! The nick name for your zone , address , gender and so on . Some of them are privacy , so you have the right to keep secret here .  
 Person1:        All information is filled in and now I can design my zone .  
 Person2:You can choose one type to make it as your background , and then find a music player and put your favorite songs into it , so your visitors can enjoy the music after entering into your zone .  
 Person1:        Now everything is OK . I can write my blog , right ?  
 Person2:Certainly .  
 Person1:        ( Half an hour , Janice begins shouting excitedly . ) What's the matter with you ?  
 Person2:Look ! David gives his following-comment on my first blog . He is my first visitor . 

informal