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: Now I know why I split up with Mike . We found we were simply not good for each other .
Person2:In what ways ?
Person1: Well , he is a typical Sagittarius guy , while I am a Cancer . We aren't really compatible
Person2:Ha-ha , so you believe in astrology ?
Person1: What's strange about that ! As a person born under the sign of Cancer , I am home-loving and wish for a peaceful family life . But according to astrology , Sagittarius guys are too adventurous and risk-taking.They seldom think of leading a settled and peaceful life .
Person2:Is that so ? I'm afraid it is too narrow-minded to judge people using astrology . It's all stereotypes !
Person1: But in my case , the fact matches the theory . Mike is humorous , energetic , always as fresh as a daisy , but probably too ambitious . It frightens me !
Person2:But as far as I remember , you two caught on like a house on fire when you first met .
Person1: Exactly . But later on , he cares more about his career than love . Work seems to be the better all , and all for him-so much that he doesn't even grudge sparing a day out with me .
Example Output: 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: OK , so this is our newest machine . It was only installed last year .
Person2:What's the running speed of the machine ?
Person1: About 1,500 metres per minute . It's one of the fastest in the world . We had a few problems with it after start-up but it's running very well now .
Person2:And what's the maximum output ?
Person1: If we're running at full capacity , it's 160,000 tonnes per annum .
Example Output:
formal