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:       I hear you ’ re taking a music class . I didn ’ t know you ’ re interested in it .  
 Person2:Oh , I ’ m not . I ’ Ve never had a music class before .  
 Person1:        In my opinion , you ’ ll make it .  
 Person2:You ’ re having me on again .  
 Person1:        No , I ’ m serious . 

informal