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:       Hi ! Susan ! I haven't seen you for ages !  
 Person2:I've been really busy . How is everything ?  
 Person1:        Oh , fine . Hey , why don't we grab a bite to eat and do some catching up ?  
 Person2:Yeah , why not ? I've got a little free time on my hands . Where do you want to eat ? 

informal