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: I can't believe it , I had faith in Bob and he let me down .
Person2:I know what you mean .
Person1: Really ?
Person2:Yes , he did the same to me .

Ex Output:
informal

Ex Input:
Person1: Merry Christmas !
Person2:The same to you !
Person1: Are you doing anything special ?
Person2:We're having some friends over.What are you doing ?
Person1: Oh . I'm just going to take it easy .

Ex Output:
informal

Ex Input:
Person1: Does this TV work well ?
Person2:Yes , it is almost new here .
Person1: Is it a color TV or a black and white TV ?
Person2:It is a color TV . You know , the rich people like the digital one now . So they have no room for them .

Ex Output:
formal