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:       Can you tell me the price for a bus pass ? 
 Person2:It costs $ 65 to buy a monthly pass . 
 Person1:        Is there a cheaper bus pass ? 
 Person2:There are student passes . 
 Person1:        For how much ? 
 Person2:It doesn't cost anything for the pass . 
 Person1:        It's absolutely free ? 
 Person2:The monthly sticker costs you . 
 Person1:        How much is that ? 
 Person2:Each month it'll cost $ 24 for a new sticker . 
 Person1:        Let me get the student bus pass . 
 Person2:Let me go get it for you . 

formal