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:       Did you like the play ?  
 Person2:Not really . It's a dull one , and the production isn't satisfactory , either .  
 Person1:        You're absolutely right . The acting could be better .  
 Person2:To be fair , though , both the costumes and scenery are marvelous . 

formal