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:       Well , I've never downloaded music before . How does it work ?  
 Person2:You haven't ? If you've never tried it I can show you how .  
 Person1:        Alright . But why is downloading music better than buying Cds at the store ?  
 Person2:Downloading music is really fast and convenient , and you can preview all the songs before you buy them . 

informal