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:       Are you feeling better today , Bill ? 
 Person2:Well , it ’ s hard to say . I coughed a lot in the evening . 
 Person1:        You ’ d better give up smoking . It ’ s bad for your health . 
 Person2:You ’ re right . But you know it ’ s so hard to give up the old habit like smoking . 
 Person1:        But you should make up your mind first . 
 Person2:You know I often have to work far into the night . I need smoking to keep me awake . 
 Person1:        Why don ’ t you go to bed early and get up early ? You ’ ll have the same time for work . 
 Person2:Thank you for your advice . I ’ ll try it . 

informal