While you cannot convert to a chapter 7, you may be eligible for a hardship discharge. To qualify you must be able to show that you can't make Chapter 13 payments due to circumstances beyond your control, the Plan cannot be modified to fix the problem, and the creditors must have received as much as they would have in a Chapter 7. This is a complicated issue, so I would suggest consulting an attorney to determine if this is right for your situation.
Your post is unclear which means the two answers above may be right or wrong.
If you got a DISCHARGE (you said dismissed, but that's rare) in your 2005 Chapter 7 you may POSSIBLY be eligible to convert.
However, if you got a discharge, you have to wait 8 years for the next 7. Your lawyer may however be able to make changes in your 13. In this situation I hope you have a lawyer and are not pro se, as you need a lawyer to review things. Get one if you do not have one.