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'.
Q: Person1: Do you have brothers and sisters ?
Person2:No , I am the only child in my family .
Person1: Oh , I have an elder sister . She is married .. Her husband is a businessman .
Person2:Do they live with you and your parents ?
Person1: No , they live alone .
A:
formal