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:       You must like negotiating a lot . People are saying , you are a super negotiator .  
 Person2:Ha , I am flattered . Actually , when it comes to negotiate , you don ’ t need to like it . You just need to understand how it works .  
 Person1:        I am not good at it by any means . Give me some advice .  
 Person2:Well , generally speaking , if you want to change someone ’ s mind or understand his position , you have to put yourself in his shoes . Understand his need and the cost for his need . And then you work together to find a solution .  
 Person1:        Sounds easy . But how can I apply to practice ? I am thinking about applying for more reimbursement for my mobile bill . But I am afraid our boss will turn me down .  
 Person2:Ok , as John after Kennedy put it , let us never negotiate out of fear , but let us never fear to negotiate . 

informal