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:       This is Mary . I just want to let you know that we made an offer to you . The salary is 3,000 yuan a month , I e-mailed the offer to you as well . You can let me know within a week if you accept the offer .  
 Person2:Thank you . I'll go through it and tell you .  
 Person1:        We hope you get on board with us , Please let me know as soon as possible .  
 Person2:I will . Thank you for all . 

informal