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:       Mike , I can't catch up with our Chinese teacher very well .  
 Person2:I advise you to take an additional course in some Chinese schools .  
 Person1:        What is that ?  
 Person2:This kind of school is good at helping people to improve their Chinese .  
 Person1:        Will they recommend me the class that suits me ?  
 Person2:Sure . You can review the lessons you have learned at school and learn something new there .  
 Person1:        That's great . I'll tell my mother about it . 

informal