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:       Okay , next question . If Eric asked you out on a date , what would you say ?  
 Person2:Duh ! I would say yes ! Eric is the most popular kid in school ! Okay , my turn . What would you do if you won the lottery ?  
 Person1:        Let ’ s see ... If I won the lottery , I would buy two tickets for a trip around the world .  
 Person2:If you buy me a ticket I will go with you for sure !  
 Person1:        My dad will freak out if I even mention a trip like that !  
 Person2:Alright this is a good one . What would your mom say if you told her you are going to get married ?  
 Person1:        If I told her that , she would faint and have me committed ! 

formal