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:       Excuse me ! I don't have time to waste . I've been here almost one full hour !  
 Person2:Sorry , madam . You have to wait your turn . The parking lot is full .  
 Person1:        Unbelievable ! Parking in this city is such a nightmare !  
 Person2:Madam , patience is a virtue .  
 Person1:        Oh , gosh ! I have to go to the restroom so bad ! I can't bear it anymore !  
 Person2:I'm sure a spot will open up soon .  
 Person1:        Oh , look ! There's a spot open next to the public restroom ! Can I take it ? 

informal