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:       What can I help you with today ?  
 Person2:When does the library close ?  
 Person1:        The library closes at six o ’ clock .  
 Person2:Does it close at that time every day ?  
 Person1:        Not always .  
 Person2:Is the library open on Saturdays ?  
 Person1:        Yes .  
 Person2:What time do you open and close on Saturday ?  
 Person1:        The hours are from 9 am - 6  
 Person2:Okay . Thank you very much .  
 Person1:        Do you need anything else ?  
 Person2:No , that ’ s all . Thanks . 

formal