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:       Hey , guys ! Did you see that sign ?  
 Person2:No . What did it say ?  
 Person1:        There's a garage sale around the corner .  
 Person2:A garage sale ... that's where people check out cars , right ?  
 Person1:        What ? Cars ? Are you serious ?  
 Person2:I'm pulling your leg , Paul . I'm a shopping queen , remember ? So of course I know what a garage sale is all about ! 

informal