Save the file as mono Mark. When you import it into your editting program the problem should be solved. But maybe your editting program even has a plugin for it that does that right away.
Another way would be duplicating the track and switch the channels around for that. But I think this will also double the volume, so you'll have to set the volume for both tracks to 50%
And another thing I noticed: occasionally the volume difference between you and the interviewee is quite different. maybe normalizing the audio files as well will help solve that.
Does it sound like I have been solving such issues myself quite a few times?