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:       Well , we've settled everything in connection with this transaction except the question of the mode of payment .  
 Person2:Because this order is a comparatively big one , we would like to pay by time L / C , say , 60 days L / C .  
 Person1:        Payment by sight L / C is quite usual in international trade , and as a rule , we only accept payment by sight L / C .  
 Person2:But we have only moderate mean at hand . If you can do us a special favor this time and allow us to delay payment , we'd really appreciate it .  
 Person1:        Accepting time L / C is unusual and I've never done it before , but we could consider your request . I'll phone our company to see what they say .  
 Person2:Thank you for your consideration . When will you let me know your answer ?  
 Person1:        This afternoon . 

formal