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:       You must be Mr.Sellers . I'm Steven . I am here to see the apartment you advertised .  
 Person2:Oh , nice to see you . The apartment is on the tenth floor . The previous tenant just moved out yesterday .  
 Person1:        Could I have a look at it first ?  
 Person2:Sure . Let me show you the way . Here we are . Apartment 1008 . ( They enter . ) This is the living room dining room combination . Here's the kitchen . It's small , but fully equipped . The refrigerator is new , and the stove and the microwave oven are less than a year old .  
 Person1:        It's nice . So this is the bathroom . And that must be the bedroom .  
 Person2:Yes . And there's a walk-in closet .  
 Person1:        Is there air conditioning ?  
 Person2:Yes , there's central air conditioning and heating . The thermostat is in the living room 。  
 Person1:        What's the house rent ? When is the rent due ? And how much security deposit do you require ?  
 Person2:It's 600 yuan per month.The rent is due no later than the tenth of the month . We ask that you leave a month's rent as a deposit . It will be returned to you at the end of your lease .  
 Person1:        I like the apartment , Mr.Sellers . You can show me the lease . 

informal