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 wish you would not be so selfish .  
 Person2:Selfishness is one human beings instincts . It is very difficult to get it out root and branch .  
 Person1:        But you should at least consider your son's future .  
 Person2:His mother , not me , should do this . 

informal