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 seems to me that everything is going digital nowadays . 
 Person2:Yes . Speaking of digital wares , I bought a digital camera last week . 
 Person1:        Cool ! What brand 
 Person2:A Sony . It's only one third the size of my old camera and looks rather smart . 
 Person1:        What about the quality ? 
 Person2:Superb ! It's a 4 megapixel one and the photos it takes are very vivid and clear . 

informal