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 , I wonder if you can help me .  
 Person2:Sure . What's up ?  
 Person1:        I'm completely lost . I'm looking for the Empire State Building .  
 Person2:Oh , this's easy . You can take the subway to 34 street . You'll see it as you get out .  
 Person1:        Great . Thanks a lot . 

informal