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:       Are you sure that this bus will take us to Santa Anita mall ?  
 Person2:Yes , it will .  
 Person1:        You know that for a fact ?  
 Person2:Yeah , I take this bus all the time .  
 Person1:        Is it a very long bus ride ?  
 Person2:It's about thirty minutes long .  
 Person1:        Do you know where we get off at ?  
 Person2:There's a bus stop right behind Macy's .  
 Person1:        Really , there's a bus stop right by the mall ?  
 Person2:There's a bus stop in the mall parking lot .  
 Person1:        That's convenient .  
 Person2:Absolutely . 

informal