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:       You know Ernie , it seems we both like the same artists .  
 Person2:Yes , we do . I think we have the same musical tastes .  
 Person1:        But if we're going to start a band , we have to be able to sing and dance . Can you do that ?  
 Person2:I'm not a very good singer , but I'm a really great dancer ! I love hip hop dancing .  
 Person1:        Great ! I'll sing , and you can dance in our band . 

informal