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'.

Example Input: Person1: I really hate to say this , but don't go away mad , just go away .
Person2:I knew this would happen some day .
Person1: Then , why didn't you try to prevent it in the beginning ?
Person2:Well . It's not all my fault , Anna . You are responsible , too .
Person1: I don't want to argue anymore . Please get out of my life !
Person2:I think we can still talk .
Person1: No way ! Please don't follow me around .
Person2:Talk it easy , Anna . You really don't hate me . do you ?
Person1: Yes , I do . Leave me alone !
Example Output: informal

Example Input: Person1: What can I do for you ?
Person2:I want to get a package of cigarette .
Person1: Have you a taste for this kind ?
Person2:No , this kind of cigarette is too strong for me , I desire a mild one .
Person1: What about this ?
Person2:It suits my taste , I'll take it . Do you have lighters ?
Person1: I have a lot of them .
Person2:Show me the one made of plastic .
Person1: OK , here you are .
Person2:Thank you .
Example Output: informal

Example Input: Person1: We will have a vacation next month . Why not have a tour ?
Person2:Good idea . Where shall we go ?
Person1: What about going to Xi'an ?
Person2:Don't you think it is too far ?
Person1: So what's your plan ?
Person2:What about going to Beijing ?
Person1: So we'll compromise . We'll hit the Huangshan in Anti .
Person2:OK !
Example Output:
formal