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 . Do you study Chinese at the university here ?  
 Person2:Yes , I do . But my characters are very bad .  
 Person1:        It takes a long time to learn Chinese writing .  
 Person2:Are you Chinese ?  
 Person1:        Yes , I am . I am from Taiwan . I came here to study political science .  
 Person2:How do you like it ?  
 Person1:        I like it so far . But my English still needs work .  
 Person2:I want to study Mandarin and international relations .  
 Person1:        Does the Chinese department here teach regular characters or simplified characters ?  
 Person2:They teach regular characters .  
 Person1:        I see . I'm from Taiwan , so I know regular characters better than simplified .  
 Person2:You just said your English needs work , yes ?  
 Person1:        Yes , that's true . Especially my writing . I think my papers aren't good enough . I make too many grammatical mistakes .  
 Person2:Well , I am very serious about learning Chinese.But for me the hard part now is pronunciation.You have the four tones in Chinese . It is very hard . Maybe , if you have time , maybe we could do a language exchange .  
 Person1:        You mean you and I ?  
 Person2:Yes , why not ? I mean , if you come to this cafe often , maybe we could meet here and practice Chinese and English .  
 Person1:        That sounds like a good idea . How often would you like to do it ?  
 Person2:Let's see ... My schedule right now is quite busy.But I think I could spend 90 minutes a week in language exchange .  
 Person1:        How would we manage it though ? How would we spend the 90 minutes ?  
 Person2:First , we could spend 45 minutes working on your English writing.If you want , I could help you edit your papers.Or we could do English conversation . Whatever you want.And then the next 45 minutes you would help me with my Chinese .  
 Person1:        Would I help you with writing ?  
 Person2:No . For me right now , the important thing is spoken Chinese . I need practice . So you could tutor me in speaking.We could use my textbook , and you could ask me questions.Then you could correct my mistakes .  
 Person1:        I think it sounds like a good system . But when is it convenient to meet ?  
 Person2:Well , today is Monday.Actually , for me Monday at this time would be the best . I am free from now until 11  
 Person1:        Me too . In fact , I'm free until 1  
 Person2:So if you want to meet at 10  
 Person1:        It sounds good . I will bring the papers I'm working on .  
 Person2:And I will bring my textbook and a tape recorder . I would like to record some things so I can practice on my own .  
 Person1:        Let me give you my phone number .  
 Person2:Sure . I'll give you mine too . Then we can call if we have to cancel for some reason . 

formal