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 . 

formal