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'.

Ex Input:
Person1: He has come to life in the end .
Person2:Oh , thank God . We all felt frightened by the bad new about him .
Person1: Yes . Fortunately , an ambulance passed in the nick of time , and we got him away to hospital .
Person2:Right . Unless , who know what will happen .
Person1: Wish him to be healthy soon .

Ex Output:
informal

Ex Input:
Person1: We're leaving now .
Person2:Here's your bill .
Person1: Right . And would you please forward our mail to this address ?
Person2:Certainly .
Person1: Thank you . Goodbye .
Person2:Goodbye . Hope to see you again .

Ex Output:
informal

Ex Input:
Person1: Mum , pass me some more please !
Person2:Tina , you should have more nutritious food.Don ' t eat these crisps any more .
Person1: But the ads say they're most nutritious .
Person2:Have you ever heard the ads say anything bad about their products ?

Ex Output:
formal