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:       Hello , reservation desk . How can I help you ?  
 Person2:I ’ d like to book a room .  
 Person1:        What kind of room would you like , Ma ’ am ? We got single rooms , double rooms , standard rooms , suites and deluxe suites .  
 Person2:What ’ s the rate for a standard room ?  
 Person1:        $ 79 a night .  
 Person2:I ’ d like a standard room .  
 Person1:        What date would you check in , Ma ’ am ?  
 Person2:December 23rd , please .  
 Person1:        How long do you plan to stay ?  
 Person2:4 days .  
 Person1:        Could you give me your name and phone number ?  
 Person2:Nancy Brown . My phone number ’ s 709 678 5634 . Nancy Brown 。  
 Person1:        Thanks . What time will you arrive ?  
 Person2:Around 3pm .  
 Person1:        Very good . Your reservation confirmation number is NB13579 . Thank you for booking in our hotel . Can I help you with anything else today ?  
 Person2:No , that ’ s it . Thank you very much . 

formal