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:       I am rejoiced to tell you that you are employed . 
 Person2:Thank you for hiring me . I'm very proud to be employed by your firm . 
 Person1:        You are expected to report for on-job training on the 15th of May . Will you be there ? 
 Person2:Yes , I will . I hope I'll enjoy working with you . 

informal