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:       Does this bus really go to the mall ?  
 Person2:It goes all the way there .  
 Person1:        Are you sure ?  
 Person2:I know it does . I catch this bus a lot .  
 Person1:        How long does it take for the bus to get there ?  
 Person2:The bus ride is only thirty minutes or so .  
 Person1:        Where do we get off the bus ?  
 Person2:Right behind Macy's is a bus stop .  
 Person1:        The stop is really at the mall ?  
 Person2:It's in the middle of the parking lot .  
 Person1:        That's perfect .  
 Person2:I know it is . 

informal