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:       Rachel , do you like music ?  
 Person2:Of course . I can't live without it , so I always bring my CD with me no matter where I go .  
 Person1:        What kind of music do you like best ?  
 Person2:Light music and classic music .  
 Person1:        Really ? I can't believe this . I am also keen on classic music . And do you know there is a concert of classic music tomorrow evening ?  
 Person2:But I didn't get the ticket . And it is said that they were sold out yesterday .  
 Person1:        I got two . We can go there together .  
 Person2:Amazing ! I can imagine the feeling when I hear the smooth tune around my ears . 

informal