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:       Another glass of beer , will you ?  
 Person2:Thanks , I'm enough .  
 Person1:        At least one for your trip .  
 Person2:I'll have it if you insist . 

informal