Detailed 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'.
Problem: Person1: Hello . I'm leaving . Here is my key .
Person2:Just one second , sir , and I'll give you your receipt . Here you go .
Person1: Thank you very much .
Person2:Sir , did you enjoy your stay here ?
Person1: Well , most of my time here was pleasant . And New York itself is fantastic .
Person2:I'm glad you enjoyed the city , anyway . But please don't think too unkindly of us .
Solution:
informal