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 ; is this seat taken ? 
 Person2:no . It's all yours . 
 Person1:        thank you very much . My name is Ashlan . It's nice to meet you . 
 Person2:Carson . It's nice to mee you , too . 
 Person1:        the weather is so warm for December , don't you think ? 
 Person2:it is unusually warm . I blame it on global warming . 
 Person1:        global warming is wreaking havoc everywhere . 
 Person2:so sure . Are you from around here ? 
 Person1:        no . I'm new here . I just moved here a few months ago . 
 Person2:where are you from ? 
 Person1:        I'm from China . What about you ? 
 Person2:I am from Texas . I was in China once , but it was a long time ago . 
 Person1:        did you enjoy it ? 
 Person2:I did . I especially liked the food . What do you think about the food here ? 
 Person1:        it's very different from Chinese food , but I am getting used to it . 
 Person2:Is that the Da Vinci Code that you've got there ? 
 Person1:        yes , have you read it ? 
 Person2:no , but I saw the movie . What do you think about it ? 
 Person1:        well , to be honest , I've only gotten though 10 pages of it . So far , though , it's interesting . 
 Person2:well , this is my stop . it was nice talking with you . 
 Person1:        likewise . Bye ! 

informal