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:       wow ! You're going to Tibet ?  
 Person2:yes , my brothe and I are going . We just finished making our itinerary .  
 Person1:        that's really cool ! I've always dreamed of going somewhere like Tibet , seeing something unique .  
 Person2:great minds think alike . My brother and I have been thinking about going to Tibet for quite a long time . Do you have anything on your schedule ?  
 Person1:        nothing particular .  
 Person2:why don't you join us ? We are leaving next week ; you'll still have a week to prepare .  
 Person1:        oh , Tibet sounds great , but I'm afraid it'll cost too much . Last time I traveled to India , and it cost me a fortune .  
 Person2:come on ! We're traveling on our own . It won't cost too much .  
 Person1:        ok , then count me in . where will we stay ?  
 Person2:the youth hotels are comfortable and cheap .  
 Person1:        then make sure that you book me a room , too .  
 Person2:I'll take care of it .  
 Person1:        and check whether they accept credit cards .  
 Person2:no problem . 

formal