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:       The show will be starting in a few minutes . We'd better go in and find our seats .  
 Person2:Number 7 and 9 of the Row 11 in the stalls , aren't they ?  
 Person1:        That's right . This entrance is for even numbers . That entrance over there is for odd numbers . Let's go over there .  
 Person2:What a nice theatre ! I guess it can seat hundreds of people .  
 Person1:        Maybe you are right .  
 Person2:Look . It's begin .  
 Person1:        Well , how did you like the show ?  
 Person2:It's so interesting , I like it very much . 

informal