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: Good evening ! I don't believe we've met before . May I introduce myself ? My name is Jack .
Person2:It's a pleasure to meet you . My name is Lucy .
Person1: I'm very happy to meet you . You're from the United States , aren't you ?
Person2:Yes , I'm from Salt Lake City .
Person1: I've been to Salt Lake City a few times . I really like your city .
Person2:I'm glad to hear that . I think it's the nicest city in the United States .
Output:
informal