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: What are in this folder ?
Person2:They are reports of our company .
Person1: Are they filed alphabetically ?
Person2:No , they are filed according to dates .
Person1: Can you find last month ' s report for me , please ?
Person2:No problem , here you are .
Output:
formal