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:       Could I order dinner ?  
 Person2:Of course . What would you like ?  
 Person1:        I want a bottle of champagne , lobster tail , and filet mignon , medium rare .  
 Person2:I'm so sorry . We ran out of filet mignon . May I suggest the porterhouse instead ?  
 Person1:        That's too bad , but the porterhouse will be okay .  
 Person2:May I be so bold as to suggest chocolate-covered strawberries with the champagne ?  
 Person1:        Not tonight , thank you .  
 Person2:No strawberries . We'll charge your amenities account , if that's okay .  
 Person1:        Charge it to whatever account you like .  
 Person2:Your meal will be delivered as soon as it's all ready . Enjoy ! 

informal