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:       you are dressed to kill . You look gorgeous , Alexander . 
 Person2:thanks . This is my power suit . I have a dinner date tonight . 
 Person1:        how did you meet each other ? 
 Person2:she's a friend of Amy . We met at Amy's birthday party . 
 Person1:        is this your first date ? 
 Person2:yes . I hope it pans out . Cross your fingers , Lily . 
 Person1:        sure it will . Oh , no , it's seven fifteen already . I'm going to be late for my date . 
 Person2:oh ... so you buried the hatchet with Steven ? 
 Person1:        absolutely not ! He's a cheater . I will never talk to him again . I'm over with him . He's history ! 
 Person2:then who will you meet tonight ? 
 Person1:        a guy I met on the internet three month ago . 
 Person2:really ? Are you sure this is a good idea ? 
 Person1:        please don't be so fussy ! I didn't just meet him yesterday . 
 Person2:I know , but remember to meet in a public place and don't give out your personal information . 

informal