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:       Do you use an anti-virus program to protect your computer ?  
 Person2:Yes , I do . I also use an anti-spyware program and a firewall . There are so many nasties on the internet and so many people who are trying to use the internet to hurt other users . You have to be very careful and keep you computer clean .  
 Person1:        How often do you run your anti-virus program ?  
 Person2:I usually run it every few days . It finds a virus about half the time .  
 Person1:        Which anti-virus program would you recommend ?  
 Person2:How you tried this one ? It ’ s very good and you can download it for free on the internet . You can also download updates for free .  
 Person1:        That sounds very good . Which website should I visit to download it ?  
 Person2:Just a minute ... go to this one . I ’ ll send you an email with the line in it . It only takes a few minutes to download . Then you have to go through the set up procedures . But they are not complicated .  
 Person1:        What do you use your computer for ?  
 Person2:I use it for several things-surfing the net , word processing and creating presentations . I don ’ t play many games on my computer , but I do a lot of work with photographs . Using c computer program , you can edit and resize photographs . You can also make them brighter or darker and cut pieces from different photographs to create new ones .  
 Person1:        Computers are great , aren ’ t they ? I should download some program and learn how to use them . 

formal