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 , how do I get to the Forbidden City ? 
 Person2:Follow this road and turn right at the second intersection . It'll be right there . 
 Person1:        Is it far ? 
 Person2:No , it should only take you about 15 minutes by foot . 
 Person1:        Thank you . 

informal