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:       Are you a blogger ? 
 Person2:Sure I am . I've been writing a blog for almost three years . 
 Person1:        Oh , it seems that I'm the only one who never blogs . When did you get started ? 
 Person2:I began blogging when I first went to the US for my graduate strides . 
 Person1:        What do you usually write about ? 
 Person2:At first , I'll write about my life there . Like interesting things on the campus , travel stories , special English words that I come across . Sometimes , I'll post my pictures on my blog so my friends and family can get to know how everything's going . 
 Person1:        That's interesting . How often do you write a blog ? 
 Person2:It's random . If there happen to be a lot of things going on , I may add several new entries in a week , and if I've got nothing to share , I may leave my blog untouched for weeks . 
 Person1:        Got it . Are you still updating your blog ? 
 Person2:Sure , since I came back from the US , I've been keeping the habit of blogging , simply to share my personal insights on any topic I like . 
 Person1:        Good for you . I know many people just leave their blogs alone after the first few months . 

informal