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:       Dora , are you interested in going to the museum with me tomorrow ? I read the newspaper this morning . I know there is an art exhibition in Taipei Modern Art Museum . 
 Person2:Sure . I am free tomorrow . It sounds interesting to me . Can we buy the ticket online ? 
 Person1:        I don't think so . I think we had better go there earlier , or we may have to spend a lot of time waiting . 
 Person2:I guess that is the thing we can do with we really want to visit the museum . 
 Person1:        Look at the ticket booth in the center . There seems to be not as many people as we thought it would be . 
 Person2:Yeah . We are lucky . Let's go buy the tickets first . We can have breakfast later . I am so hungry . 
 Person1:        Good idea . 
 Person2:( After the breakfast ) Which floor is the art exhibition we are going to ? 
 Person1:        I have no idea . Let me take a closer look at my museum map 
 Person2:Sure , take your time . We have a whole day . 
 Person1:        It's on the 2nd floor . We are going to see some beautiful paintings about the history of ancient Greece . 
 Person2:Look at the museum guide.It says there are also some sculptures and potteries in this area . Let's rent an audio guide . 

informal