Given the task definition and input, reply with output. 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'.

Person1: Are you sure this is the right restaurant
Person2:Positive
Person1: You don't think you could be wrong ?
Person2:I'am absolutely sure I'm right .
Person1: I don't know . It looks a little wrong down .
Person2:This is right . There is no doubt in my mind .
Person1: You're hundred percent sure you want to eat here ?
Person2:Check and double check .
formal