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 !  
 Person2:Hi ! Nicole !  
 Person1:        How's business ?  
 Person2:Great . We can't keep up with the demand .  
 Person1:        Wow ! I'm impressed !  
 Person2:How about you ?  
 Person1:        I quit my job as a food critic .  
 Person2:Then let me take you out to dinner to celebrate . 

informal