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:       Where are you going for your trip ?  
 Person2:I think Hebes is a good place .  
 Person1:        But I heard the north of China are experiencing severe sandstorms !  
 Person2:Really ?  
 Person1:        Yes , it's said that Hebes was experiencing six degree strong winds .  
 Person2:How do these storms affect the people who live in these areas ?  
 Person1:        The report said the number of people with respiratory tract infections tended to rise after sandstorms . The sand gets into people's noses and throats and creates irritation .  
 Person2:It sounds that sandstorms are trouble for everybody !  
 Person1:        You are quite right . 

informal