Definition: 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:  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 . 

informal