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'.

Input: Consider Input: Person1: Where can I buy textbooks ?
Person2:First , you need to have the list of books for your class . Do you have that ?
Person1: Yes , I have that .
Person2:Well , when you have that , you can take it over to the bookstore . Can you find it ?
Person1: No , I don't know where the bookstore is .
Person2:Just pass the gym and it's the first door on your left . Were you aware that you can also turn in your old textbooks for money ?
Person1: Really ? How can I do that ?
Person2:Take your used textbooks with you and give them to the representative near the entrance . He will pay you for them . Are you going today ?
Person1: No , I can't make it today .
Person2:I could help you with buying your books if you meet me there at 1
Person1: No , thanks . I'm good .
Person2:I'll see you later then . Have a great day !

Output: informal

Input: Consider Input: Person1: What do you plan to do for your birthday ?
Person2:I want to have a picnic with my friends , Mum .
Person1: How about a party at home ? That way we can get together and celebrate it .
Person2:OK , Mum . I'll invite my friends home .

Output: informal

Input: Consider Input: Person1: You know Ernie , it seems we both like the same artists .
Person2:Yes , we do . I think we have the same musical tastes .
Person1: But if we're going to start a band , we have to be able to sing and dance . Can you do that ?
Person2:I'm not a very good singer , but I'm a really great dancer ! I love hip hop dancing .
Person1: Great ! I'll sing , and you can dance in our band .
Output: informal