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 do you think of the speech the man delivered just now ?  
 Person2:Don't believe him . He's a liar .  
 Person1:        We cannot expect politics to be true anyway .  
 Person2:Exactly . 

formal