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 are you doing ?  
 Person2:I ’ m just looking for a nice pillow on Ebay .  
 Person1:        You are shopping for a pillow online ? That ’ s absurd !  
 Person2:Why ? I don ’ t have to leave the house or browse a dozen stores to find what I ’ m looking for . This way , I just search for it online quick and easy .  
 Person1:        I see , but how do you pay for it ? How do you know you aren ’ t going to be ripped off by the seller ?  
 Person2:Well , the website handles a point system where if the seller does something wrong , people comment negatively and then you know that he or she may not be trustworthy .  
 Person1:        Wow , that sounds pretty safe . So how do you pay ? Do you need a credit card ?  
 Person2:You can use a credit card or your debit card . They also let you use the Paypal system which is really safe and fast . I have never had any problems with someone hacking my information or anything .  
 Person1:        Do you think I can find a sweater for my dog online ?  
 Person2:You can find anything ! Are you sure you want to start shopping online though ? Once you step into this world , there is no turning back !  
 Person1:        Let ’ s do it ! 

informal