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 have some good news for you . We've decided we'd like to send you to Shanghai on a business trip this weekend .  
 Person2:oh .  
 Person1:        don't you think that it'd be a good thing for you to get out of the office for a couple of days ?  
 Person2:sure .  
 Person1:        I thought you'd be a bit more excited about this . Everything will be paid for and I'll send my assistant with you to take care of everything for you . All you have to do it get on the train tonight a  
 Person2:the train ? Will I be flying back then ?  
 Person1:        oh , no . We've brought your return ticket for you . I think you'll find it comfortable .  
 Person2:will the train be very crowded ?  
 Person1:        oh no . the train hasn't been crowded at all recently . Besides , you're in first-class , so you'll be fine .  
 Person2:when is the first meeting then ?  
 Person1:        they've scheduled the negotiation meeting for 9:00 tomorrow morning . That should give you enough time to have a quick shower .  
 Person2:where will I be staying ?  
 Person1:        we've booked you a room in the same hotel as your meetings , so you won't need to deal much with the transportation system .  
 Person2:that's very sensible . Would it be alright if I left early today to prepare for the trip ?  
 Person1:        that's not a problem . Have a nap if you can . You don't know how tight the schedule is for this business trip . 

informal