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:       You said you like classical music very much . Then who is your favorite opera star ?  
 Person2:There are three of them , the Three Tenors .  
 Person1:        Oh , you mean Pavarotti , Domingo and Carreras . Have you been to their live shows ?  
 Person2:Yeah , it's really a unique experience . It's a solo concert by Pavarotti . He put on the performance in the Forbidden City in Beijing .  
 Person1:        I've heard of that one . It was also his swan song .  
 Person2:Besides , speaking of classical music , we should never forget about the New Year's Concert .  
 Person1:        Of course not . People all over the world watch it on TV , or listen to it on the radio .  
 Person2:Sure . It's undoubtedly one of the biggest classical music events . Have you ever been to the live show ?  
 Person1:        Yes , I went to the New Year's Concert in 2005 .  
 Person2:Wow , you are so lucky . I saw that one on TV . But it must be so different to be there in the concert hall .  
 Person1:        That's for sure . You know , it's really amazing to be in the best concert hall , listening to the performance by the best orchestra . I had the greatest time ever .  
 Person2:Who was the conductor at that event ?  
 Person1:        Lorin Maazel . He did an amazing job . Moreover , he just celebrated his 75th birthday .  
 Person2:So cool . I wish I can go to the live New Year's Concert someday in the future .  
 Person1:        The right opportunity for you would come along soon . You know , music is transnational .  
 Person2:I believe in that . Well , the performance is about to begin . Let's be quiet . 

informal