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:       Hey man ! How ’ s it hanging ?  
 Person2:Hey man ! Everything is just groovy baby !  
 Person1:        Did you go to the roller rink on Saturday ? I heard it was far out , man !  
 Person2:I wanted to , but I ran into this foxy lady that just moved to my block ! I was chatting her up a bit and then we mellowed out at her place .  
 Person1:        Right on , right on ! Well , Jim went to the rink with Sherry and he said it was dy-no-mite ! He was low on bread , but Sherry paid for everything .  
 Person2:Gravy ! Jim is such a jive turkey man . He is always hitting me up for cash . Anyway , you wanna book and go grab some grub ?  
 Person1:        Yeah man , I ’ m starving ! 

formal