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:       Tom , did you see the film last night ?  
 Person2:Yes , I did , I thought it was a failure .  
 Person1:        Do you really think so ? I don't think so . It wasn't that bad film at all . Didn't you hear the applause of the audience ?  
 Person2:Well , maybe so . But I still think everyone has their rights of their own opinion .  
 Person1:        Well , i don't see the point of arguing this . 

informal