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:       You should not have criticize your son in front of his friends .  
 Person2:Why ? He did something wrong .  
 Person1:        I know . But at that time your blame is rubbing salt into his wounds .  
 Person2:I only wanted to help him .  
 Person1:        But it is not the right time . 

formal