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:       Good morning . Your ticket and passport , please ?  
 Person2:Here you are .  
 Person1:        Do you have any baggage to check in ?  
 Person2:Yes , one box .  
 Person1:        Would you please put it on the scale ?  
 Person2:OK . By the way , can you tell me how many kilos of free baggage each passenger is allowed ?  
 Person1:        The baggage allowance is different according to the class of your ticket . What class are you travelling ?  
 Person2:First-class .  
 Person1:        For a first-class passenger , the free baggage allowance is forty kilos .  
 Person2:How many pieces of baggage can I carry on to the plane ?  
 Person1:        Passengers holding first class tickets may carry 2 pieces within the total weight of 5 kg onto the plane .  
 Person2:If my baggage exceeds the allowance , what should I do ?  
 Person1:        If the checked baggage is over the allowance , we will charge you for the overweight .  
 Person2:I see . Thank you very much for your information .  
 Person1:        You're welcome . Your boarding pass and baggage check , please .  
 Person2:Goodbye ! 

informal