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:       Are you studying here ?  
 Person2:Yes , I am studying in Eastern Asian language department .  
 Person1:        What are you majoring in ?  
 Person2:I major in Japanese .  
 Person1:        What do you think of the literature course ?  
 Person2:It's very helpful . The course has let me into a new world of literature . I read so many great literatures . 

informal