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 ! Is that the new laptop you brought last week ? It looks very nice . 
 Person2:Yes , it is . Thanks . I ’ m just surfing on the internet . 
 Person1:        Here ? In this cafe ? How can you do that ? 
 Person2:This cafe offers a wireless internet connection . That means I can get on the net for free while I ’ m here . Of course , I have to buy a cup of coffee ! 
 Person1:        That ’ s great . Can you do it anywhere ? 
 Person2:No . you can only do it when the cafe offers a wireless connection . There are only about 10 or 12 places that offer it in this city . 
 Person1:        So , what programs do you have on your laptop ? 
 Person2:I ’ Ve got all the usual ones for word processing and then I have a few for creating and editing photographs . 
 Person1:        I know you are keen on photography . It ’ s very useful for you to be able to download photos from your digital camera . Then you attach the picture files to emails and send them to anyone , anywhere , at anytime ! 
 Person2:It ’ s wonderful , isn ’ t it ? Would you like to see some photos that I look recently ? 

informal