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:       Can you recognize that woman , Millie ?  
 Person2:I think I can , Kate . It must be Karen Marsh , the actress .  
 Person1:        I thought so . Who ’ s that beside her ?  
 Person2:That must be Conrad Reeves .  
 Person1:        Conrad Reeves , the actor ? It can ’ t be . Let me have another look . I think you ’ re right ! Isn ’ t he her third husband ?  
 Person2:No , He must be her fourth or fifth .  
 Person1:        Doesn ’ t Karen Marsh look old !  
 Person2:She does , doesn ’ t she ! I read she ’ s twenty-nine , but she must be at least forty .  
 Person1:        I ’ m sure she is .  
 Person2:She was a famous actress when I was still a schoolgirl .  
 Person1:        That was a long time ago , wasn ’ t it ?  
 Person2:Not that long ago ! I ’ m not more than twenty-nine myself . 

informal