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:       It's weekend again , I'm glad I can arrange for my personal matters .  
 Person2:What do you mean by that ?  
 Person1:        Oh , that means I can do whatever I like without few interruptions .  
 Person2:You've been always active and versatile . It seems that you are interested in everything .  
 Person1:        Oh , really ? I just have lots of hobbies in my spare time ; such as going to the concert , painting , handwriting , reading novels and reading fashion magazines . What about yours ?  
 Person2:I have fewer hobbies than yours . That's why I find campus life a bit dull and uninteresting .  
 Person1:        Oh , you can't think like that . We young people should try our best to learn new things and accept new ideas . You like taking photos and going to photography shows , why not practise the technique and catch something unforgeable ?  
 Person2:That's a good suggestion . It's fine today . Maybe I can take photos on the scenery of the lake at sunset . It must be fantastic .  
 Person1:        I quite agree with you . With our hobbies , our life can be more colorful and exciting .  
 Person2:And I can concentrate on my study after the relaxation over the weekend .  
 Person1:        Yes , it's a good habit to have a life-long hobby . Those who practise calligraphy and Qigong always live longer . 

informal