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 hope we could offer the most favorable terms .  
 Person2:I am sure you will find our prices are most competitive . Here is our offer . All the prices on the list are firm . If your order is a sizeable one , we could reconsider our prices .  
 Person1:        Good . Is there any commission included ? We are commission agents .  
 Person2:As a rule , we don't allow any commission . However , as an encouragement for businesses , we will allow you a 3 % commission .  
 Person1:        Ok . How about the earliest possible shipment ?  
 Person2:By the coming September .  
 Person1:        Could you make an offer on FOB basis ?  
 Person2:Certainly ! 

formal