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:       And how will you be paying for your room , Ms White ?  
 Person2:By credit card .  
 Person1:        Both rooms on the same card ?  
 Person2:Yes .  
 Person1:        Your card number please ?  
 Person2:4434 1234 5678 9902 .  
 Person1:        Double one , zero two ?  
 Person2:No , double nine zero two .  
 Person1:        4434 1234 5678 9902 ?  
 Person2:That's right .  
 Person1:        And the expiry date ?  
 Person2:Eleven , ...  
 Person1:        Could you repeat that please ?  
 Person2:November this year .  
 Person1:        Thank you . I've booked two rooms for Ms White and Mr Webber from Wednesday the 25th to Saturday the 28th of September .  
 Person2:Thank you .  
 Person1:        You're welcome . We'll see you on the 25th , Ms White .  
 Person2:Thanks a lot . Goodbye .  
 Person1:        Goodbye . 

formal