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:       The question is easy for everybody.Don ' t you think so ?  
 Person2:Yeah , it's very easy . But it's above Nick's head  
 Person1:        Why do you say so ?  
 Person2:He's always confused by easy questions . 

formal