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: 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 .

Output: informal

Input: Consider Input: Person1: Wow ! Look at the time . lt's about 11 0 ' clock .
Person2:Really ? I didn't realize it was so late .
Person1: I've got to catch the last bus . See you later .

Output: informal

Input: Consider Input: Person1: Do you know how to go to the Fragrant Hills in Beijing ? I heard that they are very famous in China .
Person2:Yes . Especially in autumn , the red leaves of the maple trees make the whole mountain red .
Person1: That must be very beautiful .
Person2:Yes , it can make people feel as if they were in the land of fairies .
Person1: Really ? Have you ever been there ?
Person2:A couple of times .
Person1: Can you go there with me ? I'd like someone who is familiar with that area to go with me .
Person2:Sure . I'd be very glad to be your tour guide .
Output: informal