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 college are you attending ?  
 Person2:I am in Nanjing University . I am a junior .  
 Person1:        Why did you choose to attend that college ?  
 Person2:Because it enjoys great reputation and it is located in my favorite city Nanjing .  
 Person1:        What kind of college is it ?  
 Person2:Ii is distinguished for the strength of law and foreign languages studies .. 

formal