What is the purpose of the party? To______to Mr. Smith. [originaltext] (16)

(16) Today we are here to hold the party to say goodbye to Mr. Smith.(17) We all know that he’s going to leave us soon and he’ll become the manager of New York’s branch of the company. I’m very happy that he has been promoted.(18) Mr. Smith has been working with us for the past five years.(19) His working ability and kindness have left us a good impression. I think his absence from our office will be a great loss for us. However, it is lucky for the stuff in New York’s office to have Mr. Smith as their manager. We’ll be sure to miss you very much, Mr. Smith.(20) We wish you the very best luck in your future work and we also hope to keep in touch with you regularly.