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:       Excuse me , madam . May I see your ticket , please ?  
 Person2:I'm afraid I have lost my ticket . Can I buy one again ?  
 Person1:        Where are you going ?  
 Person2:I'm going to Nanchang .  
 Person1:        Where did you begin your journey ?  
 Person2:At Huangshan .  
 Person1:        OK . Here you are .  
 Person2:And by the way , what time shall we get to Nanchang ?  
 Person1:        We'll get there around 7:45 in the morning .  
 Person2:Thanks . 

formal