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 are you doing there with your mobile phone ? 
 Person2:I'm moblogging ! 
 Person1:        Moblogging ? what does that mean ? 
 Person2:Oh , moblogging is a combination of the word ' mobile ' and ' blogging ' . It's another form of blogging . Users can publish blog entries to the web from a mobile phone or other mobile devices . 
 Person1:        Sounds interesting ! That must be very convenient . 
 Person2:Yes , you're right . I can blog wherever and whenever I'm on the move . It's especially good when I'm on a business trip and my laptop happens to be away from me . 
 Person1:        How can you do that ? 
 Person2:Well , if I simply want to write a few words , I'll send it by email or edit it all from the cell phone browser . 
 Person1:        What if you want to publish some photos ? 
 Person2:Then I'll shoot some pictures , re-size the images and upload them with text descriptions to my blog . 
 Person1:        I see . Moblogging must have done a great favor for habitual bloggers like you . 
 Person2:You bet it ! 

informal