You will be given a definition of a task first, then some input of the task.
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'.

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 .
Output:
formal