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:       How many people are there in your family ?  
 Person2:My immediate family is quite small . It ’ s just my older step-brother , my mom , my step-dad and me . how about you ?  
 Person1:        I have a large family . I have three older sisters , my twin sister , a younger brother , and parents .  
 Person2:I didn ’ t know you were a twin ! Are you identical or fraternal ?  
 Person1:        We ’ re identical . I mean , we look exactly the same , but we are complete opposites when it comes to everything else .  
 Person2:Interesting . It must be great having a twin sister . Are you best friends , too ?  
 Person1:        We used to be really close , but that all changed once she moved to Shanghai . How about your family ? You didn ’ t mention to your biological father .  
 Person2:I don ’ t know much about him . He died when I was just a baby . Even though I don ’ t have a blood relationship with my step-father and step-brother , I consider them to be my real family .  
 Person1:        What about your step-brother ’ s mother ? Does he keep in touch with her ?  
 Person2:No , she also died when my step-brother was little . My mother and my step-father met each other shortly after my father died and became good friends . They ended up getting married a few years later .  
 Person1:        Sounds like it was meant to be . 

formal