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:       I don't know , but he gives me the creeps .  
 Person2:Just take it easy . If he starts to bother you , let me know and I'll call security .  
 Person1:        But what if he knows my name , where I live ...  
 Person2:Don't get all worked up over him . He's probably harmless .  
 Person1:        Actually , he's really good-looking . Too bad he's a weirdo .  
 Person2:You never know . Maybe he's just an innocent , lonely guy ...  
 Person1:        Now he's looking over here ! He's coming !  
 Person2:OK ! I'll call security . 

informal