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:       Shall I take a photo of you ?  
 Person2:Could you ? Thank you .  
 Person1:        You ’ re welcome . What brings you to China ?  
 Person2:I ’ m actually here on business .  
 Person1:        I see and what do you do for a living ?  
 Person2:I ’ m an IT salesman .  
 Person1:        That sounds like a good job .  
 Person2:It ’ s very interesting actually .  
 Person1:        Ok , well enjoy the rest of your stay here .  
 Person2:Thank you very much . Bye . 

informal