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:       Are you travelling in America ?  
 Person2:No , I am on business . I will spend half a month for the business .  
 Person1:        What do you do ?  
 Person2:I am currently working in a foreign company as a salesman .  
 Person1:        I know all the tricks of the trade . It is quite tiring and difficult to be promoted .  
 Person2:Maybe . But it provides much wider space for me to improve the skills and increase the experience . What about you ?  
 Person1:        I am a reporter at a TV station .  
 Person2:Do you like your job ?  
 Person1:        Yes , I have good working conditions and I would require a salary at least 15 , 000 $ a year .  
 Person2:Which kind of news do you catch ?  
 Person1:        I report the social news which means I always interview the citizens of various professions and trades .  
 Person2:Are you feel tired ?  
 Person1:        Sometimes . News happened out of expectation . Sometimes I have to get up in the early morning while I can't sleep for editing and interviewing .  
 Person2:You have to experience this if you want to be an extraordinary reporter .  
 Person1:        That's right . I am still wet behind the ears . 

formal