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:       Bruno's . 
 Person2:Hi , I'm calling from Nika Corporation . We would like to hold a business lunch at the restaurant . 
 Person1:        Oh , certainly . I'm Linda , the Manager . I can help you with that . How many will there be in your party ? 
 Person2:There will be about 18 people . 
 Person1:        Okay . For a party that size , we have a separate banquet room in the back . 
 Person2:Is there an extra charge to reserve the room ? 
 Person1:        No , as long as you can guarantee at least 15 guests , there is no extra charge . 
 Person2:That's great . I'd like to go ahead and reserve the room , then , for Friday , December 2 , at around noon . This is a retirement party and we'd like to bring a cake for the guest of honor and some bottles of champagne . Will that be acceptable ? 
 Person1:        The cake is no problem at all , but we do charge a corkage fee of $ 15 a bottle for any alcohol not purchased from the restaurant . 
 Person2:Oh , that's fine . 
 Person1:        Great . I have the banquet room reserved for a lunch on for Nika Corporation on the 2nd of December . May I have your name and contact information ? 
 Person2:Sure . I'm J McQuillin and my number is 323-555-6840 , extension 42 . 
 Person1:        Thanks , Mr . McQuillin . I'll give you a call a week in advance to confirm the arrangements . 
 Person2:Sounds good . Thanks for your help . 
 Person1:        Thank you for choosing Bruno's . We look forward to seeing you on the 2nd . 

informal