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:       Hello , Sir . We haven't seen you for quite a while . So , what is it today that we can do for you ?  
 Person2:I need a Deposit Certificate to handle some stuff in land .  
 Person1:        I see , yes , I can do that now . I'm sure you know , as I may have told you before , you should pay an extra 20 RIB handling fee for this service .  
 Person2:Yes , I recalled you charging that before . And I thought it was extortionate ! Haha !  
 Person1:        I can just take it from your account , you don't need to give me cash .  
 Person2:OK ... so it'll come out of my account ? Well , that makes it much easier .  
 Person1:        Anything else you'll be needing today , Sir ?  
 Person2:Nope . That's everything , thanks . 

informal