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: 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 .

Ex Output:
formal

Ex Input:
Person1: Hi ! Someone has reported a fault on one of your copiers .
Person2:That's right . I'm glad you're here . It hasn't been working properly for the last few days .
Person1: When was it serviced ?
Person2:Just a couple of weeks ago . It's usually very reliable .
Person1: What's actually wrong with it ?
Person2:Well , it's making a strange noise when we try to change paper trays .
Person1: I'm sure it's nothing serious , probably just a minor fault . I'll have a look at it .

Ex Output:
formal

Ex Input:
Person1: I ' m thinking about redecorating my bedroom . I bought this magazine in order to get some ideas . What do you think of this ?
Person2:That looks good . The room in the picture is bigger than your bedroom , so you wouldn ' t be able to have all that furniture in your room .
Person1: I ' d like to have the bed and the wardrobe .
Person2:You would fit both of them in your bedroom . Perhaps you could also get the dressing table . I think that one would look good in your bedroom .
Person1: Yes , it would . It ' s very expensive though .
Person2:Everything in this magazine seems expensive . You could probably find something similar in a discount store .
Person1: Yes . I ' m sure I could find something similar at one . I ' d also like to get a new carpet for my bedroom .
Person2:You can get cheap carpets easily . Another idea is to buy a rug . That would cover a lot of the carpet and you wouldn ' t have to replace the carpet . It would save you a lot of work .
Person1: That ' s a good idea . I ' m really looking forward to redoing my bedroom .

Ex Output:
informal