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 have to leave soon ? 
 Person2:No . Actually I can stay longer . Dave called to say that there is a beautiful Chinese girl who ’ s going to pick me up at the school gate tonight at ten thirty instead of eight thirty . 
 Person1:        Oh , that ’ s better . So you don ’ t have to rush . 
 Person2:Yeah . You know what Dave just said ? 
 Person1:        What ? 
 Person2:He said I should put on something very nice , because this girl will be my next target . 
 Person1:        He knows you very well . 
 Person2:He always makes fun of me . He always says things like that . You know the new coming teacher , a Chinese Canadian . He said she would really be my chance . 
 Person1:        I ’ m sure you have chances everywhere . You ’ re handsome , talkative , and got a sense of humor . You must be very popular . 
 Person2:No , you ’ re kidding . I ’ m not taking it seriously . 

formal