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:       May I see your airplane ticket , passport and health certificate please ?  
 Person2:Here you are .  
 Person1:        Will you please put your luggage on the scale ?  
 Person2:I want to check these three pieces and I'll carry this overnight bag by myself .  
 Person1:        Sir , your bags are 30 pounds over weight . You are allowed only 45 pounds of baggage .  
 Person2:Well , then , how much do I owe you ?  
 Person1:        That comes to H . K . $ 120 . 

formal