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:       What a beautiful view , my sweetheart ! 
 Person2:It sure is.The Grand Canyon is truly masterpiece . No man could ever make anything like this . 
 Person1:        What is that below ? 
 Person2:It is the Colorado River . You will go down the river in a boat if you wish . 
 Person1:        No , thank you.It looks a bit too dangerous for me . 
 Person2:There is a beautiful state park here . I can see why so many people come out here to camp . 
 Person1:        Yes , there is this beautiful view . you may go fishing , camping and also enjoy this beautiful clean air . 
 Person2:It definitely is a nice change from the polluted and crowded city . 
 Person1:        You are so romantic , my sweetheart . 

informal