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:       What did you think of the film ?  
 Person2:I liked it . I thought it was great .  
 Person1:        Yes , I liked it , too . Did you like the acting ?  
 Person2:Yes . I thought it was excellent . Didn't you ?  
 Person1:        Not really . I thought it was disappointing .  
 Person2:It's a nice cinema , isn't it ?  
 Person1:        Do you think so ? I don't like it very much . I found it rather uncomfortable . 

informal