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:       Couldn't you extend the delivery period by two weeks ? That would make things much easier for us .  
 Person2:Well , you know the time of shipment means a lot to us .  
 Person1:        I can understand , but our company is fully committed at the moment , and hundreds of clients are placing orders for delivery these days .  
 Person2:I see.OK , that's agreed then . 

informal