Please. Thank you or Thanks or Thanks alot. Excuse me. You’re welcome or Anytime or even No problem. (The traditional response to Thank you is not Thank you!!! Unless, of course, you’re genuinely and enthusiastically more grateful to them than they are to you…which is rare.) Would/Do you mind if. Could you.
And if you’re driving a large vehicle and parking it in a parking lot, try not to park it near the door, because then smaller vehicles, especially the Disabled who have to park between you and the door, can’t see around your vehicle to other moving vehicles coming down that aisle. Please.