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:       I'm checking out now . Can I have my bill , please ? 
 Person2:Sure . What's your room number , sir ? 
 Person1:        It's 8736 . Here is my key card . 
 Person2:A minute , please . It's 6212 yuan all together . Tax included . 
 Person1:        Can I pay with traveler's check ? 
 Person2:Sure . Can I have your passport , please ? 
 Person1:        Here you are . 
 Person2:Thanks . Are you satisfied with your stay here with us , sir ? 
 Person1:        Very much . The room is cozy and the service is jolly good . By the way , could you deliver my luggage to the airport in advance ? 
 Person2:Sure . It will be taken care of , sir . Which flight do you take ? 
 Person1:        Flight 17 . And my luggage should be delivered there by 4 o'clock . 
 Person2:Got it , sir . It'd be great to see you again , sir . 
 Person1:        Thank you . 

formal