Definition: 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:       I am very interested in a new apartment near the Taxing Plaza , but the price is very high , I really can't afford it . 
 Person2:How much is it for each square meter ? How large is the apartment ? 
 Person1:        It's 7500 yuan per square meter , and I really like the one with three bedrooms and a large living room . Its total area is about 80 square meters . 
 Person2:That surely will cost you a lot of money . Are you going to make a full payment ? 
 Person1:        Do you think I am rich enough to make it ? I am thinking about buying the apartment by installments . The real estate agency says if I pay a 25 % down payment , I can move in at once . 
 Person2:If sounds so tempting . Why not go applying for a loan from the bank ? They charge very low interest , so you can choose whether to pay up the balance in 10 or 20 years . 

formal