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:       Don't open any of my forwards ! I got a virus !  
 Person2:Don't tell me you got the dreaded Bush virus . I've heard that that bug is threatening to infect the world .  
 Person1:        Yes , that's exactly the bug I got . Though , I do kind of like the pictures .  
 Person2:Those clothes do suit him better .  
 Person1:        Wait a second-are these pictures copyrighted ?  
 Person2:Probably not . It's off the Internet . What difference does it make ? 

formal