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 do you do in your free time , Nancy ?  
 Person2:Well , I like playing the violin .  
 Person1:        Really ? How long have you been playing the violin ?  
 Person2:About ten years so far . I started learning when I was in middle school .  
 Person1:        That's really interesting .  
 Person2:Sure . So what about you ? Do you have any hobbies ?  
 Person1:        Well , I like collecting matchbox ! I'm not sure if that counts , though .  
 Person2:Of course it does . Everybody has his own hobby . 

informal