Dear Johnny,
Thanks for offer me the job interview opportunity.
However, after discussed with my current manager, I realized there are many interesting projects at here my manager is going to ask me to do, I don't think it is a good time to leave at this moment.
Although I appreciate all your helps, I am sorry I wll not go for the interview this time.
Looking forward to working with you when the chance coming in the future.
Sincerely Yours
心不安的豬媽蜜.