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:       I want to buy two tickets for tonight's concert .  
 Person2:Sure . How do you like your seats ?  
 Person1:        Ordinary one , please .  
 Person2:Ok , here are your tickets in Row 13 .  
 Person1:        I think they are too far from the stage . I want two in row 6 .  
 Person2:That's fine . But you have to pay another $ 10 . 

informal