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: Is this the A housing office ?
Person2:Yes , it is . Are you looking for housing for this semester ?
Person1: I was hoping to get into something on campus , but my friend told me that everything is full .
Person2:It is , but I can put you on a waiting list , if you would like .
Person1: Please . And in the mean time , can I look at apartments available in the area from this office ?
Person2:Yes , here is a catalog that is put out every year with locations that meet campus requirements for As .
Person1: Who do I talk to if I want I to see some of them ?
Person2:The individual landlord's numbers are next to each entry . You can call them with any questions you may have .
Example Output: formal

Example Input: Person1: Hey ! What's up ?
Person2:Hi , John ! I haven't seen you for ages .
Person1: Yeah , I've been out of town .
Person2:So how have you been ?
Person1: Great ! Work is really busy now , but it's fun .
Example Output: informal

Example Input: Person1: Does this bus really go to the mall ?
Person2:It goes all the way there .
Person1: Are you sure ?
Person2:I know it does . I catch this bus a lot .
Person1: How long does it take for the bus to get there ?
Person2:The bus ride is only thirty minutes or so .
Person1: Where do we get off the bus ?
Person2:Right behind Macy's is a bus stop .
Person1: The stop is really at the mall ?
Person2:It's in the middle of the parking lot .
Person1: That's perfect .
Person2:I know it is .
Example Output:
informal