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:       Come in , please .  
 Person2:Good afternoon , Mrs Smith .  
 Person1:        Good afternoon . Have a seat , please . You are Mr . Sun ?  
 Person2:Thank you . Yes , I am Dunlin .  
 Person1:        I have read your resume . I know you have worked for 3 years . Why did you choose to major in mechanical engineering ?  
 Person2:Many factors led me to major in mechanical engineering . The most important factor is I like tinkering with machines .  
 Person1:        What are you primarily interested in about mechanical engineering ?  
 Person2:I like designing products , and one of my designs received an award . Moreover , I am familiar with CAD . But I can do any mechanic well if I am employed .  
 Person1:        Why did you decide to apply for this position ?  
 Person2:Your company has a very good reputation , and I am very interested in the field your company is in .  
 Person1:        What do you think determines an employee's progress in a company such as ours ?  
 Person2:Interpersonal and technical skills .  
 Person1:        We have several applicants for this position . Why do you think you are the person we should choose ?  
 Person2:I have the abilities , qualities and experience that you requested in your job advert , for example I have three years experience in designing products and I got leadership experience while serving the college student union as president .  
 Person1:        That sounds very good . How do you see your career development ?  
 Person2:After a few years of gaining experience in the company and furthering my professional qualifications I'd like to put my experience and skills to use in management . I want to become a supervisor in your R & D department .  
 Person1:        Have you anything to ask about the job ?  
 Person2:Yes . Do you offer any opportunities for further study ?  
 Person1:        Yes . If you undertake additional courses , provided these are approved , and you complete them successfully , you can claim back part , quite a large part , 75 % of the costs you incurred . Not just the fees , - traveling and other expenses too .  
 Person2:That's fine .  
 Person1:        Anything else ?  
 Person2:No .  
 Person1:        Well , thank you very much , Mr . Sun . I'll let you know the result of the interview as soon as possible . Goodbye .  
 Person2:Thank you , Mrs . Smith . I do hope the answer will be favorable . Goodbye . 

informal