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 , Mr Kowalski ?  
 Person2:I'm here , hello .  
 Person1:        Which city are you staying in right now ? And the name of your hotel ?  
 Person2:I'm in Beijing , at the Weston Hotel .  
 Person1:        Do you have your passport with you ? Or do you by any chance know the number ?  
 Person2:I don't have it to hand , but I know the number . It's 16211469 9 . Can you do anything , like stop the card for example ?  
 Person1:        Let me repeat that back to you , 16211469 9 . That's just what I've done , Mr Kowalski , I've stopped your card temporarily .  
 Person2:But , what do I do if I need cash ?  
 Person1:        You can go to any branch of IBA and request the Emergency Assistance Service . Everything will be taken care of , there's no need to worry .  
 Person2:Thank you so much . I'll find the nearest branch and come in tomorrow . Thanks again for all of your help . 

informal