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:       Did you see the information on sales for last year ? The sales review was made at our last board meeting . There's a great news for our shareholders .  
 Person2:Yeah , I went over the figures this morning . We're finally started making money again !  
 Person1:        We've never sold this much before , our growth this year has been phenomenal . We have captured 8 % of the market , up from last year by 120 % . Our strategy is working !  
 Person2:not only our annual sales brake a record , but our month by month earnings exceeded our forecast as well . After a two-year slump , we finally back in the black .  
 Person1:        The company's performance has improved since Wallace became president . He's made our little business into a real lucrative operation . Products are selling like hotcakes .  
 Person2:I think our success is partly because of Wallace's contribution , and partly because of our new marketing strategy . Because of the new advertising campaign , we have become the top sellers in the field .  
 Person1:        Let's hope this stroke of good luck lasts . I hope we are over our financial difficulties for good .  
 Person2:Let's hope it is ! 

informal