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 have a lovely house , Jack . 
 Person2:Thank you . But a number of things have been going wrong lately . 
 Person1:        That's too bad . What problems are you having . 
 Person2:Oh , the whole house needs re-painting for starters . The carpet in the living room is worn out , and I'd like to put in new wall-to-wall carpeting . Last week , I had to call the plumber to fix the toilet . Anyway , all par for the course when you own a house , I guess . I think I am going to hire an interior decorator to look the place over . 
 Person1:        I ’ Ve studied home decoration as a hobby . Could I make some suggestions ? 
 Person2:Go right ahead . 
 Person1:        Well , I think a crystal chandelier would look great in your living room , and maybe some new drapes for the windows . Also , a grandfather clock would look great in the den . Perhaps you could buy some potted plants for the dining room 
 Person2:Well , you really do have a talent for this , Alice . Thanks for the suggestions . 
 Person1:        You are welcome , Jack . Glad to be of help . 

informal