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 would like to get a bus pass . 
 Person2:Do you know what kind of pass you want ? 
 Person1:        Can you tell me my options ? 
 Person2:There are passes for a day , month , and week , and there are student passes . 
 Person1:        I would like the student pass . 
 Person2:Let me see your student ID . 
 Person1:        Here you go . 
 Person2:Thank you very much . 
 Person1:        How much will it be for the pass ? 
 Person2:The monthly sticker is $ 24 , but the actual pass is free . 
 Person1:        That'll be fine . 
 Person2:We appreciate your business . 

informal