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:       What do you say we stop in at that Burger King over there and grab a bite ?  
 Person2:Forget it ! If you think I ’ d ever set foot that inferior restaurant again , you gotta be nuts . Last time I ate that food , almost vomited . The service in there is terrible . It was the first time I ever stiffed a waiter  
 Person1:        Yeah , not seeing a single person anywhere informed me . Hey ! How about that one over there ?  
 Person2:Oh , give me a break ! That place is too lavish for us .  
 Person1:        Easy . It ’ s on me .  
 Person2:In that case , I ’ m right behind you . 

formal