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:       Doris , I'm glad you're home . I'm terrified . I don't know what to do ! 
 Person2:What is it ? What happened ? 
 Person1:        I think someone is stalking me . 
 Person2:No , it can't be . Really ? Who ? 
 Person1:        I don't know . I saw him the first time Tuesday . He was at the cafe . I noticed he was looking at me a lot . Not just the usual looking , but staring.He just kept staring at me . He didn't stop . 
 Person2:What did you do ? 
 Person1:        I didn't do anything . Finally , he left.But then I saw him again today . Outside the shoe store . Near the cafe . I went into a CD store and pretended I was looking at CD's . But then he came in too . 
 Person2:Did he leave when you left ? 
 Person1:        Yes . Then I noticed he was on the sidewalk behind me . He was following me . 
 Person2:What did you do ? 
 Person1:        He followed me all the way home ! 
 Person2:That's about five blocks . And around corners too.So he was definitely following you . 
 Person1:        Yes , he was . I'm not imagining it.Finally , just when I got home , I turned around and looked at him.He was just standing there . He didn't smile . He just stood there . It was so obvious.What should I do ? I'm so scared . Can I call the police ? 
 Person2:Actually , I don't think you can call the police . Not yet at least.He hasn't done anything . And probably the police will just ignore it.But if anything happens again , then maybe you should call . 
 Person1:        Why can't I call the police now ? He was definitely following me ! 
 Person2:Of course you can call the police if you want . That's not what I mean . I'm just saying that they probably won't do anything . 
 Person1:        I suppose . What can they do ? I don't even know who he is . 
 Person2:Listen , Carol . Don't let this bother you too much.Probably it's nothing . Just keep your eyes open when you go out.If you see him a third time , and if he follows you again , then I think we should go to the police.But for now , just try not to worry . 
 Person1:        Alright . And I won't go to that cafe for awhile . 

informal