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:       Have you any beef today ?  
 Person2:Yes , we've got a very tender new shipment from the mainland . It is a weekend special .  
 Person1:        How much is it a pound ?  
 Person2:One pound and fifty pence a pound .  
 Person1:        Good . I'll get three pounds of it .  
 Person2:Here it is . Four pounds and fifty pence in all . 

informal