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:       I'm not sure , is this our stop ?  
 Person2:Yeah , get off the bus .  
 Person1:        Do you have any idea where we are ?  
 Person2:I'm really not sure .  
 Person1:        This can't be the right stop .  
 Person2:I don't think this is right .  
 Person1:        We got off too early , didn't we ?  
 Person2:Yeah , we did get off too early .  
 Person1:        I should've just stayed on the bus .  
 Person2:I messed up .  
 Person1:        Great , we have to walk now .  
 Person2:You want to wait for the next bus ? 

informal