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 just dropped in to say good-bye .
Person2:What time are you leaving ?
Person1: I'm going to try to leave by ten .
Person2:Take care and give my best to your parents .
Person1: Good-bye . Hope to see you soon again next year .
Person2:Don't forget to call us if you're in Tokyo .
Output:
formal