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: Hi , Dave . You're early .
Person2:So you knew it was me ?
Person1: I had an idea .
Person2:Look , before we get into the secret admirer thing , I want to talk to you about WebTracker .
Person1: I'm sorry . I know you feel betrayed .
Person2:So you're really planning to quit invoking and switch over to WebTracker ?
Person1: My mind is made up .
Solution:
formal