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:       Hi , I'm Lucas , I just moved in next door .  
 Person2:Oh , hi Lucas , come on in . I'm Barbara . Nice to meet you .  
 Person1:        Nice to meet you too .  
 Person2:Would you like something to drink ? I've got tea and some grape juice .  
 Person1:        Thanks . Some tea would be nice . Chinese tea is great . I really like your tea set . Where did you get it ?  
 Person2:Oh , there is a supermarket not far from here . But there is also a tea house around the corner , where you can get tea , taste tea and get a tea set as well .  
 Person1:        Oh yeah , I saw the tea house the other day . I think I might go and have a look sometime . It's a nice neighborhood here .  
 Person2:You are right about that . It's quiet and very convenient . You can get to the bus and the subway stations within ten minutes ' walk . There's a grocery store , a book store , a gym , and many restaurants along the street .  
 Person1:        There's a gym nearby ? That's exciting ! I really want to start to go to gym as soon as possible . I've been lazy this summer holiday and have put on some weight .  
 Person2:Well , if you want we can go together sometime . Actually I was thinking of going this afternoon , if you like , you can join me and I can show you the neighborhood along the way .  
 Person1:        That would be wonderful . Thanks ! 

informal