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:       Hi ! Dear ! I'm waiting for you .  
 Person2:I know that .  
 Person1:        You know , although we've chatted twice , I've been thinking of you already .  
 Person2:Me too . I want to know more about you , eg , what's your real name and what do you look like ...  
 Person1:        & you ?  
 Person2:Look , I am playing the piano for you .  
 Person1:        Oh , thanks . I wanna see the real you .  
 Person2:Sorry , I have no photo in my computer . And I have no scanner . I will show you later .  
 Person1:        OK ! Before that I'll take this one as you .  
 Person2:Ha ! She is too little .  
 Person1:        Cute , like you .  
 Person2:I want to tell you that I like you  
 Person1:        Me too . Send you a kiss ...  
 Person2:Thx . 

informal