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's the problem ? You don't look happy . 
 Person2:I failed my oral test . 
 Person1:        How come ? 
 Person2:I'm not practicing enough . 
 Person1:        Why don't you go to the English corner to talk to your classmates in English quite often ? 
 Person2:When I talk to Chinese , I always want to speak Chinese . 
 Person1:        You should always keep in mind , the more you practice , the better English you can speak . 

informal