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:       Mr . Tang , we have decided to hire you . How much do you expect to get a month ? 
 Person2:I'm making three thousand yuan a month at my present work . I should not , of course , make a change for less . Could you provide me with a monthly salary of four thousand yuan ? 
 Person1:        I don ’ t think we can give you that much as the starting salary . 
 Person2:You know , Mr . Allen , Nowadays this starting salary is not high based on my skills and experience . 
 Person1:        Maybe , but there are many fringe benefits here . 
 Person2:What are they ? 
 Person1:        Additional to medical benefits , we also offer a rent free house and the use of a car . 
 Person2:But I have my own car and my own house . 
 Person1:        OK , 4000 yuan a month . 
 Person2:Thank you very much . 
 Person1:        Not at all , it's reasonable . 

formal