Instructions: 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 .
Output:
informal