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 cough 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 hard to give up an old habit .  
 Person1:        But you should make up your mind first .  
 Person2:You know , I often have to work till late at night . I need something to keep me awake .  
 Person1:        Why don't you go to bed and get up early ? You'll have the same time for work .  
 Person2:Thank you for your advice ! I'll try it . 

informal