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 can ’ t attend the meeting in Washington . I ’ Ve proposed you as the most able substitute .  
 Person2:But I ’ Ve never been on a business trip before !  
 Person1:        It ’ s easy enough . Just make sure you keep track of all your expenses . The accounting department will reimburse you for all your meals and travel expenses .  
 Person2:So the company will pay for everything ?  
 Person1:        Yes , but when you send in your expense report , you also have to file a report summarizing your trip . It ’ s not just a big vacation , you know .  
 Person2:That sounds good . But what do you want me to do there ?  
 Person1:        I ’ Ve already paved the way . You just have to give a presentation on what our products are . I will do the follow-up and close the sale . 

formal