Translation of cóncavo

I congratulate you on your move to become a private Spanish teacher. People need to believe in you and the most important thing is that you need to believe in yourself. It won't be easy at the beginning.
Please postpone by three days to one week. I am abroad, and Loraine can't come with the baby. We are available from august 31 until September 23 (except September 16) where we have other commitments.
By the way, Jeffrey and Brooke got married before the trip and this vacation was their honey moon. On the deck Jeffrey suddenly noticed that he had lost his wedding ring. It was probably in the bag.