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:       John , my father isn't there at all . Are you kidding ?  
 Person2:Poor , fellow , what's the date today , buddy ?  
 Person1:        It's ... oh it's the 1st April , April Fool's Day .  
 Person2:You forgot all of about it , didn't you ? 

informal