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:       I'd like to start by talking about prices .  
 Person2:I'd be glad to answer any questions you may have .  
 Person1:        Your products are very good , but the price you ask is much too high .  
 Person2:If you consider our high research costs and excellent quality , the price we are asking is only reasonable .  
 Person1:        I know , but we want 1000 pieces . This is a very large order . So , can you give us a 25 percent discount ? 

informal