What is the position for which you are applying? If it's as a procedure room nurse (assisting the doc with the scoping), you don't have anything to bring to the table UNLESS you are able to convince whoever's hiring that you are exceedingly detail-oriented (required), a very fast-learner (over-used, true, but it's going to necessary here). You will need to be able to take direction well, move quickly, and be exceptionally meticulous: infection control, specimen-handling, etc require extreme care.
If the job is in PACU/discharge, you can focus on your strong assessment skills, ability to multi-task more than might be expected (you may have a number of patients at different points in their recovery path to discharge, all needing something).
Admissions would require strong IV skills, plus attention to detail to catch things on their med sheets, allergies, etc that need to be passed on.
Both admissions and discharge nurses require friendly, warm personalities, as you are going to be facing patient after patient after patient who is nervous, anxious, and oftentimes with an equally-so family member. You have to be able to be professionally calm without being cold. They need to know YOU know what's going on, and that everything will be fine; many a nurse thinks they do this....but don't.
Strong people skills, I can't stress enough. I realize this might be said of any area of nursing, but hopefully I gave you a little insight