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:       I have tickets to The Phantom of the Opera on Friday night . Would you like to go ? 
 Person2:Thanks . I'd love to . What time is the show ? 
 Person1:        It's at 8: 00 . 
 Person2:That sounds great . So , do you want to have dinner at 6:00 ? 
 Person1:        Uh , I'd like to , but I have to work late . 
 Person2:Oh , that's OK . Let's just meet at the theater before the show , around 7:30 . 
 Person1:        That sounds fine . 

informal