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 really should stop smoking , you know .  
 Person2:I know . I know . I don ’ t smoke too much , though .  
 Person1:        How many cigarettes do you smoke a day ?  
 Person2:About a pack , more if I drink .  
 Person1:        Wow . You ’ re really a heavy smoker .  
 Person2:No , I ’ m not . My father smoked two packs a day for forty years .  
 Person1:        He died of lung cancer , right ?  
 Person2:Yeah ... you ’ re right . I really should stop smoking . 

formal