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 , Bob . Are you getting the feeling you've been here before ?  
 Person2:Yes , I'm sure I've been here before .  
 Person1:        Maybe we're walking in circles .  
 Person2:Yes , there's that bar we passed an hour ago . 

formal