sure thing
interj. B1 Intermediate
interj. a casual way to say yes or you're welcome. You use it when you agree to help someone or want to show that something is no problem.
interj. expresses enthusiastic agreement or confirmation; functions as a formulaic response to a request or an expression of gratitude. Characteristic of North American English.
Can you help me move this table? Sure thing.
Thanks for the lift to the station. Sure thing, I was heading that way anyway.
Usage
Used as a standalone response; can substitute for 'certainly' when agreeing to a task or 'you're welcome' when thanked.