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: How many rooms are you looking for ?
Person2:Oh , four or five . How much is the rent for this apartment ?
Person1: 150 a month .
Person2:150 ? No , I'm not really interested in this place . It isn't big enough . It isn't near enough to my office .
informal