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:       Does your country export a lot of natural resources ?  
 Person2:We export some coal to European countries , but our biggest exports is copper , which we export to Europe , north America , and China .  
 Person1:        Which resources do you have to import ?  
 Person2:We import a little oil from Venezuela , but we are fairly self-sufficient . We import some iron and a lot of aluminium from neighbouring countries .  
 Person1:        I heard that you country recently discovered deposits of precious stone .  
 Person2:Yes , that ’ s right . So far , only small deposits have been found . Engineers in my country are focusing on drilling for oil . The government is keen to exploit our natural resources to get money to improve our country .  
 Person1:        If your government invests in your country ’ s infrastructure , it will be money well spent .  
 Person2:Yes . We need to put the money into long-term projects rather than wasting it on short-term ones . 

formal