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:       What are your terms of payment ?  
 Person2:Our terms are net 30 .  
 Person1:        What if we purchase an increased quantity ? Can you give us better terms ?  
 Person2:You would have to order in excess of 10,000 units to be eligible .  
 Person1:        We do not have the space in our warehouse to store over 5,000 units .  
 Person2:An option we can offer is two separate shipments.We will house the inventory until you are ready for us to ship it to you . 

formal