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:       We'd better cover the porcelain ware against All Risks .  
 Person2:All right . Our insurance coverage is 110 % of the invoice value , up to the port of destination only .  
 Person1:        I'd like to have the insurance of the goods covered up to 130 % of the invoice amount .  
 Person2:Ok , this premium for the difference between 130 % and 110 % of the invoice value should be borne by the buyer .  
 Person1:        That's understood . 

informal