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:       Can you recommend a resort to me ?  
 Person2:What about the Yellowstone National Park ?  
 Person1:        Have you ever been there ?  
 Person2:Yes . The scenery is so breathtaking .  
 Person1:        What is especially impressive ?  
 Person2:There are thousands of hot springs and fountains . The park is known for them .  
 Person1:        Is there a waterfall ?  
 Person2:Yes . The well-known Yellowstone Waterfall is formed when the Yellowstone Lake falls down into the Yellowstone Canyon .  
 Person1:        What an attractive place ! How can I get there ?  
 Person2:You can take No . 2 bus . 

informal