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:       Hi ! I see you are having fun with your new computer and internet connection .  
 Person2:There ’ s so much I want to do . I ’ Ve just finished sending lots of emails to friends and family all over the world . I just ran a search for music to download .  
 Person1:        I can give you the name of a few useful website to visit .  
 Person2:Thanks . That would be very helpful . I ’ Ve discovered that it can take a long time to find exactly what you want . There ’ s too much information on the net .  
 Person1:        When you sent your emails , did you attach any files to them ?  
 Person2:Yes , I did . There ’ s an anti-virus program with my email account that scans all attachments , so I ’ m sure I haven ’ t sent anything nasty to anyone .  
 Person1:        When you use the internet , be careful not to give out your email address very often . If you do , you might get a lot of spam-unwanted email from companies trying to sell you things .  
 Person2:That ’ s good advice . I should also be careful about giving out confidential information about myself , such as my password and credit car number .  
 Person1:        That ’ s right . Another thing to remember when you are surfing is that you can add a web page to your list of favourites . Your computer will remember the page and you can return there quickly next time you want to visit .  
 Person2:How do I do that ?  
 Person1:        Take this web page for example . Press the keys “ control ” and “ d ” together . Click on “ favourites ” at the top of the screen . There you are . It has been added to you favourites list . If you click it , you will automatically go to that web page again .  
 Person2:That ’ s useful to know . Thanks . I ’ ll just log off and shout down my computer and we can go for a coffee . 

informal