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:       Have you considered upgrading your system ?  
 Person2:Yes , but I'm not sure what exactly I would need .  
 Person1:        You could consider adding a painting program to your software . It would allow you to make up your own flyers and banners for advertising .  
 Person2:That would be a definite bonus .  
 Person1:        You might also want to upgrade your hardware because it is pretty outdated now .  
 Person2:How can we do that ?  
 Person1:        You'd probably need a faster processor , to begin with . And you also need a more powerful hard disc , more memory and a faster modem . Do you have a CD-ROM drive ?  
 Person2:No .  
 Person1:        Then you might want to add a CD-ROM drive too , because most new software programs are coming out on Cds .  
 Person2:That sounds great . Thanks . 

informal