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:       Japanese is easy to learn .  
 Person2:You're mistaken about it . As a matter of fact , it's very hard .  
 Person1:        I don't think so.There ' re so many familiar characters and they sound just like Chinese .  
 Person2:You're quite right.But many Japanese learners begin with smiles on their faces and end up with tears in their eyes . 

informal