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:       We are going to need confirmation on these orders today , and delivery must be made before next Tuesday . Do you think you can handle that ? 
 Person2:We are willing to work with you , but do you think it would be possible to extend your confirmation deadline ? We need to check the warehouse to make sure the products are in stock . The earliest I will be to get back to you is tomorrow morning . 
 Person1:        No , I must know today because we have to go to press for the advertisements . Is there anyway you can speed up the process of checking inventory ? 
 Person2:We can do that , but it will cost ... If we have to check our inventory with all our guys on overtime , you're looking at an increased cost of , I'd say , maybe 10 % . 
 Person1:        Are you kidding ? 
 Person2:No , and let me tell you why ... If I make my guys stay over to check the inventory , I'll have to pay them at an overtime rate , which is time and a half . I estimate it will probably take 3 guys two hours to finish , that will be an increase on your labor fee by at least 10 % ... if you need the numbers that urgently , I can have them do it . Otherwise , we can wait until tomorrow morning , and I'll call you with the numbers after they're done . It's your call ... 

informal