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:       Here we are , Ryan ! This is where we're going to celebrate !  
 Person2:It's a ETV palace ! I'm glad I brought my platinum card .  
 Person1:        You won't need it . Stanley , my best man , is going to treat everybody !  
 Person2:Where is Stanley ? It was his idea to have the bachelor's party at a ETV , wasn't it ?  
 Person1:        If it were up to Stanley , we'd have the wedding in the ETV ! He loves to sing .  
 Person2:Then I bet he's really good !  
 Person1:        Well , uh , I'll let you decide that for yourself . He'll be here a little later . Here's our room ! 

informal