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'.

[Q]: Person1: Oh , my god . How can you stand living in such a messy dorm ?
Person2:Our place is spotlessly clean , compared with others .
Person1: Have you even tried to clean it once since you moved in at the beginning of the semester ?
Person2:In fact , I just swept the floor three days ago .
Person1: I think we need to restart the dormitory sanitation inspection system .
Person2:I bet nobody will care about it .
[A]: informal

[Q]: Person1: What is up ?
Person2:Look at the dishes ! I have told you three times to put away these dishes . But now ...
Person1: Oh , don ' t be angry . I just thought you might need them sometime .
Person2:I have told you that I don ' t need them any more . The thing that really annoys me is that you played dumb with me .
[A]: formal

[Q]: Person1: Reservation Center , Air China . Can I help you ?
Person2:Yes . I'm coming to confirm my ticket .
Person1: May I have your name , please ?
Person2:My name is Zu Ping . In fact , I have a reservation on Flight No . 125 for Zhenjiang , leaving Beijing at 2:00 p . m . tomorrow . Now I'd like to make a change of my travel schedule . Is it possible to change my booking to the day after tomorrow ?
Person1: Certainly .
Person2:Do you have a seat available on the same flight the day after tomorrow ?
Person1: Yes . You are reconfirmed on Flight No . 125 for Zhenjiang , leaving Beijing at 2:00 p . m . on January 15th .
Person2:Thanks a lot .
Person1: You are welcome .
[A]:
informal