Cold symptoms 4 days before surgery, will I be able to have surgery?

If your surgeon says it’s okay to proceed with surgery, then it should be fine. Normally, rescheduling the surgery to when you’re in better condition would be ideal. It would also improve the whole experience, since you wouldn’t have to deal with your symptoms in addition to recovering from your surgery.

While feeling less than completely healthy at the time of your abdominoplasty is suboptimal, it may be reasonable to proceed if your symptoms are mild. It's smart to keep in contact with your surgeon so that he/she can help make the best decision with regards to proceeding or postponing your procedure. Fevers and sputum production would be reasons to postpone the date of your surgery. Hope you feel better soon. 

I am sorry to hear about your concerns prior to your day of surgery. Generally speaking, patients undergoing elective surgery should be at their optimal (or close to) level of health prior to proceeding. It is especially important that there be no compromise of pulmonary function or active source of infection present.
Your plastic surgeon will be the only relevant resource when it comes to determining your ability to proceed at this time.
Best wishes.