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:       It's a sunny day , isn't it ?  
 Person2:Yes , it is . I'm Jennifer . Nice to meet you .  
 Person1:        My name is David . Nice to meet you , too .  
 Person2:Are you American ?  
 Person1:        No , I'm a Britisher . Where do you come from ?  
 Person2:I come from America . Are you a freshman ?  
 Person1:        Yes . What about you ?  
 Person2:Me , too .  
 Person1:        Great . Maybe we can study and play games together . I think we can be good friends .  
 Person2:Yeah . Anytime . 

informal