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:       People are funny .  
 Person2:They sure are .  
 Person1:        Did you hear about the pilot ?  
 Person2:The one that stole a small plane ?  
 Person1:        Yes , he stole a plane in Canada and flew into the U . S .  
 Person2:Did they catch him ?  
 Person1:        Yes . After two U . S . fighter jets followed him for an hour , he landed on a highway .  
 Person2:Did he crash ?  
 Person1:        No , he just landed the plane and walked to a restaurant .  
 Person2:Did the cops find out why he flew into the U . S . ?  
 Person1:        His life sucked . He was hoping a fighter jet would shoot him down .  
 Person2:Poor guy . 

formal