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:       Yeah . You don't need to rub it in .  
 Person2:And then she made the deal with MicroPower . Vince wanted to sell for fifteen million ...  
 Person1:        Fifteen ? And Zina pushed them up to seventy-five ?  
 Person2:That's right . Vince still stops by her office every day to thank her .  
 Person1:        Anyway , I'm still happy I left . I'm working as a freelancer now .  
 Person2:You really should have stayed with us , Dave . 

formal