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'd like to buy a house about 300m with a garden . Can you help me ?  
 Person2:Sure . We've helped more than ten thousand people buy and sell houses . We're the No . 1 realtor in this community . I recommend this house ( He points at a picture ) .  
 Person1:        Where is it ?  
 Person2:On a hill to the east of the Tarsus river . You have a good view of the beautiful sunrise and sunset . You can't find a better home to live in .  
 Person1:        How many rooms are there ?  
 Person2:Eight rooms , a roomy kitchen , two modem bathrooms , a lovely dining room , a gorgeous living room and three sweet bedrooms . All are built with first-rate materials .  
 Person1:        How much is it ?  
 Person2:6 million . You needn't pay the whole price at one time . You just pay 50 % in cash . We'll process the legal documents for you and then you can borrow the other 50 % from a bank and repay it in installments . We ask for only 1 % as commission .  
 Person1:        OK . How much is the deposit ?  
 Person2:Ten thousand . 

formal