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:       so ... what kind of things do you do in your free time ?  
 Person2:I'm really into watching foreign films . what about you ?  
 Person1:        I like to do just about anything outdoors . Do you enjoy camping ?  
 Person2:camping for an evening is ok , but I couldn't do it for much longer than one night !  
 Person1:        have you ever been camping in the Boundary Waters ?  
 Person2:no , but I've always wanted to do that . I've heard it's a beautiful place to go .  
 Person1:        it's fantastic . My family and I are very fond of the place .  
 Person2:do you have any photos of any of your camping trips there ?  
 Person1:        sure , would you like to see them ?  
 Person2:that'd be great . What kind of camera do you have ?  
 Person1:        I have a Canon SLR .  
 Person2:so , you must be pretty interested in photography then .  
 Person1:        I'd call it one of my hobbies . Do you know much about photography ?  
 Person2:actually , I do . I took quite a few photography classes at University .  
 Person1:        have you heard about the photography exhibit that's going on at the art gallery this weekend ?  
 Person2:yes , I was planning on going . Are you ?  
 Person1:        yes.In fact , maybe we could go together .  
 Person2:that'd be great . what time should I meet you there ?  
 Person1:        how about at 11:00 ?  
 Person2:sounds great . see you then . 

formal