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: Wow ! That ' s a pretty dress , but it ' s too expensive .
Person2:Yeah , it is ! Why is it so expensive ?
Person1: It ' s because of good quality and the fine design .
Person2:I don ' t think it ' s worth that money .
Person1: Anyhow , this dress is really elegant .
A:
formal