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: Anyone home ? Jen !
Person2:I'm in the kitchen ... let yourself in !
Person1: Wow ! You're really working up a storm !
Person2:I know . I've even worked up a sweat .
Person1: You look like a cooking show host--only messier .

Ex Output:
formal

Ex Input:
Person1: Excuse me , sir ? I just need a little bit more information . Could you tell me your telephone number and mailing address ?
Person2:Sure . My number is 545-8897 , and I live at 908 Mulbury Street .
Person1: That ' s 545-8897 and your mailing address is 908 Mulbury Street . The zip code is 20310 , right ?
Person2:That ' s right .

Ex Output:
formal

Ex Input:
Person1: How long will it take to learn English ? Will I be able to take other courses next semester or will English take up all of my time ?
Person2:It ' s hard to say . Language isn ' t like other studies .
Person1: You mean I could finish this course and still not know English ? You ' Ve got to be kidding !
Person2:I ' m not kidding . Learning a language is a question of forming language habits and that takes time .
Person1: So do we have to stay in this English class forever ?
Person2:No . You just have to stay here long enough to get some orientation . Then you go on practicing and learning outside . A lot of learning depends on your personal motivation .
Person1: So it ' s really the same story . Practice , practice , practice and more practice is the only way to learn a language .
Person2:You said it .

Ex Output:
informal