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:       Excuse me , you look lost.Can I help you ?  
 Person2:Oh , Thank you . I'm looking for the train station .  
 Person1:        Right.Let me see.You go straight down here and turn right .  
 Person2:Right ? OK , got it .  
 Person1:        Then take the next left then the next right.Are you with me ?  
 Person2:Next left then right ? OK . 

informal