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 , please.Could you tell me how to get to the No . 10 Middle School ? 
 Person2:Walk down this road , take the fourth turn to the right.Then you'll see it . 
 Person1:        Is it far from here to there ? 
 Person2:No . It's only about five minutes ' walk . 
 Person1:        Many thanks ! 
 Person2:Not at all . 

informal