There really isn't any way in any software to remove an echo.
You can try the dynamics filter and use the gate component.
That will basically cut the audio below a certain level and will reduce the issue up to a certain point, but it can also make things worse if the reverb is really pronounced.
All I can recommend is a hanging few sound blankets around on your next shoot and keep any shotgun mic within a few feet from the source.
I haven't been able to find a plug-in or filter to do this, but I was turned on to an external box that did wonders and saved a shoot for me. It's called the Cedar DNS1000. We rented one for about $100 locally. Buying the box is WAY too expensive. Give it a try next time you need to remove echo or reverb from a recording. I wish they could put their technology into a plug-in. That would be killer!