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 . Could you tell me the way to the Star Hotel ?  
 Person2:Yes . Go down the main road . You can't miss it .  
 Person1:        How long will it take me to get there ?  
 Person2:It's only about a five-minute walk .  
 Person1:        Thank you very much .  
 Person2:You're welcome . 

informal