If someone has ever asked you to meet about something, or is requesting a job to get done ASAP, don’t feel obligated to give an immediate reply. They should respect your time enough to let you look at your lists (calendar, tasks, etc.) before letting you get back to them.
Oh yeah, this requires you to briefly write down what they need before you walk away. It doesn’t make you look good when you have to ask them to repeat their question because you weren’t paying attention.