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's that , a new video game ?  
 Person2:Nope ! It's the latest generation of PAD ! You won't believe what it can do .  
 Person1:        For instance ?  
 Person2:It has a built-in camera unit that takes digital color stills . It also plays MP3 files , which I can save on media cards and then transfer to the hard drive of my computer .  
 Person1:        Wow ! Anything else ?  
 Person2:This one comes with its own folding keyboard . It has a pre-installed handwriting recognition program . I can use the stylus to write on the screen .  
 Person1:        What if I want to use CD-ROMs or floppies ?  
 Person2:Just plug in a peripheral CD or floppy drive and you're ready to go ! 

informal