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 need help in ordering my office supplies .
Person2:You can print out a copy of the Order Supply Form from our company web site and turn in into me . What will you be needing ?
Person1: I need ink cartridges , staples , and Post-its .
Person2:Will you need all of them right away or can some wait ?
Person1: Some of these can wait but there are a few things that I need right away .
Person2:You can only buy supplies that you have a budget for . Do you know what your budget is ?
Person1: We have plenty of money for office supplies .
Person2:You can pick these supplies up or they can be delivered to your building . Which would you prefer ?
Person1: I want to pick them up .
Person2:Well , just finish the request and we will contact you when the supplies come in . Have a good day !
Person1: You too !
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: It's wonderful to be in the mountains after a hustle bustle week .
Person2:Indeed . I love the smell of the grass and trees . They certainly refresh my mind .
Person1: Can we stop here for a while ? My backpack is very heavy .
Person2:Sure . Did you hear anything ? Look ! An eagle is hovering in the sky .
Person1: Let me see . It's not an eagle . I think it's a vulture .
Person2:Yes . Will it hurt us ?
Person1: I don't think so . Let's walk by the stream . I am sure we can find the waterfall on the map .
Person2:OK . I have a good pair of hiking boots . It should not be a big problem .
Person1: I also brought a bottle of water and some provisions . If you are hungry , you can let me know .
Person2:You are kind . Look there is a big tree over there , it looks like a thousand-year-old tree .
Person1: Well , it is a birch tree.It is not as old as you think .
Person2:How do you know ?
Person1: Because its trunk is not thick enough to be like a thousand-year-old tree .
Example Output:
informal