He IS the most reliable client. Kindly allow me to serve you again next time
He is a good client. He gives you all the time to do his paper.
Thanks a lot for allowing me to serve you. Kindly allow me to do more orders for you in future.
He is a good client, very cooperative and understanding, I enjoyed working for him and would love working for him him in future.
He is a good client. Easy to work with!