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:       Hey , let's arm wrestle !  
 Person2:Not now .  
 Person1:        Chicken ! You're afraid I'll beat you .  
 Person2:Are you kidding ? I just feel tired right now . 

informal