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 .  
 Person2:It sure is . The Grand Canyon is truly a masterpiece . No man could ever make anything like this .  
 Person1:        What is that below ?  
 Person2:It is the Colorado River . You can 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 beautiful view . You can go fishing , camping and also enjoy this beautiful clean air .  
 Person2:It definitely is a nice change from the polluted and crowded city .  
 Person1:        That's true . 

informal