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've never met anyone like Clyde before .  
 Person2:He's such a buppie-a black yuppie . Black people come in all shapes and sizes . Just check out the party .  
 Person1:        Wow ! There are so many different people here . I expected mostly athletes and rappers .  
 Person2:You'll find some of those here , too . But not if you don't shake it up ! There's an African saying , “ If you can talk , you can sing ! If you can walk , you can dance ! ”  
 Person1:        Then I'll just shut up and sit down ! 

informal