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 seems that you get antsy when you hear I praise another guy .  
 Person2:I get antsy not because you praise a guy , but because you may be taken for a ride by a guy like him .  
 Person1:        How come you think of him that way ?  
 Person2:Because you seem to have lost your vigilance . You should be on the watch out .  
 Person1:        I have no reason to distrust him . He's never caused any harm .  
 Person2:Isn't there anything that sounds fishy ?  
 Person1:        Nothing smells a rat . I told you that he's an all-right guy .  
 Person2:All-right guy ? All right . Let's talk about something else instead . 

informal