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:       What's your favorite kind of music ? Do you like pop music ?  
 Person2:I like almost all kinds of music . But I like country music best .  
 Person1:        There was a concert country music last week .  
 Person2:I wish I had been there !  
 Person1:        I like it , too . But sometimes I enjoy jazz and classical music .  
 Person2:You have good taste in music . 

informal