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:       Do you know how to go to the Fragrant Hills in Beijing ? I heard that they are very famous in China .  
 Person2:Yes . Especially in autumn , the red leaves of the maple trees make the whole mountain red .  
 Person1:        That must be very beautiful .  
 Person2:Yes , it can make people feel as if they were in the land of fairies .  
 Person1:        Really ? Have you ever been there ?  
 Person2:A couple of times .  
 Person1:        Can you go there with me ? I'd like someone who is familiar with that area to go with me .  
 Person2:Sure . I'd be very glad to be your tour guide . 

informal