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:       When do we get off the bus ?  
 Person2:I think we have a while longer .  
 Person1:        I feel like we've been on this bus forever .  
 Person2:That's true .  
 Person1:        Are you sure we weren't supposed to get off already ?  
 Person2:I don't know .  
 Person1:        I thought you knew where we get off at .  
 Person2:I wasn't really paying attention . I think we missed our stop .  
 Person1:        Seriously ?  
 Person2:Yeah , we definitely missed our stop .  
 Person1:        That's the last time I get on a bus with you .  
 Person2:My bad.sorry ! 

informal