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:       Your office called and said that the owners had made a counter-offer to my offer to purchase their house .  
 Person2:To your offer of three hundred and twenty thousand dollars , the owners have counter-offered three hundred and thirty-five thousand dollars .  
 Person1:        I think that maybe I should accept their offer .  
 Person2:You , of course , have two ways of responding . You can say yes or come up with another offer .  
 Person1:        I want to make another offer , but I am afraid that they will decline and I will lose this house .  
 Person2:There is always a chance that someone could outbid you , but you could try one more offer if you like .  
 Person1:        I would now like to offer three hundred and thirty thousand dollars as a counter-offer .  
 Person2:After the owners get home from work tonight , I will approach them with your offer .  
 Person1:        Can you tell me how long it will take them to get back to me ?  
 Person2:I don ’ t think that it will take as long as the response to the first offer . 

informal