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 have a boyfriend ?  
 Person2:Yes . Why ?  
 Person1:        Well , I came to know a girl 3 weeks ago and we have so much in common .  
 Person2:So ?  
 Person1:        So I think I may fall in love with her .  
 Person2:You are attracted to her . That sounds great , but how do you know that it is a crush or it's real love ?  
 Person1:        Then what's the difference between having a crush and falling in love ?  
 Person2:That's a big question . Well , if you are in love , maybe you ’ ll take every opportunity to talk to her or telephone her for no reason at all .  
 Person1:        That's what I did .  
 Person2:And you think about her all the time ?  
 Person1:        Yes .  
 Person2:And maybe you suddenly have new interests . I mean you suddenly begin to do things you used to avoid , ie.You used to sleep in every morning , but because she jogs every morning , then you begin to like jogging .  
 Person1:        That's it . She likes dogs so much now , and I begin to love dogs .  
 Person2:Oh , congratulations ! Sounds like you ’ Ve found your soul mate .  
 Person1:        Thanks . But I know falling in love is one thing , while staying in love is another .  
 Person2:Yeah , that's right . If you find this person is more and more important to you and you can totally trust her , then you can stay in love .  
 Person1:        Yeah . Falling in love is so good !  
 Person2:While staying in love is even better . 

informal