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: 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 .

Output: formal

Input: Consider Input: Person1: I have never you mention this friend . Are you on very good terms with him or her ?
Person2:We have been on good terms . She is a very nice girl . But she got in Dutch with her boss . I don ' t have the heart to see her pounding the pavements .
Person1: You must be stuck on her , or you would not use your elbow grease .
Person2:Well , we hit it off with each other . Nothing more , nothing much .

Output: formal

Input: Consider Input: Person1: How do you do . I ' m Mark Rancor .
Person2:Nice to meet you .
Person1: May I know your name , please ?
Person2:I ' m Rose Teller . I think I ' Ve seen you somewhere before ?
Person1: Ah , yes . I remember now.Were you Mr . John ' s dinner partner last month ?
Person2:Yes , I was.You work for 3M , right ?
Person1: I did but now I ' m for Microsoft.How are things with you ?
Person2:Good .
Person1: May I know what you do ?
Person2:I ' m a fashion designer.Next month , I have a fashion show . I ' d love it if come . I can get you a couple of tickets.So you can bring a friend if you like .
Person1: Sure.That would be great.Good luck .
Person2:Thank you .
Output: formal