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: Is it true that rice is the staple food in most of Southeast Asia ?
Person2:I'm not an expert , but that's the impression I have .
Person1: Is rice your staple food , too ?
Person2:Needless to say , as a Westerner , it's bread .
Solution:
formal