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:       Actually I have a passion for Chinese literature .  
 Person2:You do ?  
 Person1:        Yeah , those classics from the great writers .  
 Person2:But I find Japanese ones better . 

informal