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:       Where are you studying and what's your major ?  
 Person2:I am studying at Beijing University . I major in Civil Law .  
 Person1:        Why did you choose Beijing University ?  
 Person2:Because Beijing University is the best university in China and I'm sure I am one of the best students .  
 Person1:        What courses have you learned ?  
 Person2:I have learned many courses , such as Civil Law , Economic Law , Commercial Law and Administration Law .  
 Person1:        Which one is your favorite ? Why ?  
 Person2:Civil Law . Because it is broad and profound , and furthermore , it best reflects the spirits of fairness and equality .  
 Person1:        What was your minor subject ?  
 Person2:Psychology . 

formal