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'v been work here for nearly a month , how do you feel about the job ? 
 Person2:Not bad.Thank you for your help . I am always busy with this job , I feel a bit tired . 
 Person1:        I had the same feeling when I first came to work here . but after a period of time , I feel better , I am sure you ' ll get used to this busy job . 
 Person2:I also feel that work efficiency here is very high . and you have strong working ability and professional skill , it seems that you know all , that's really wonderful ! 
 Person1:        You know the phrase , the survival the fittest . We have no choices . 
 Person2:That's right , I have to work hard . 

formal