I have already booked my roundtrip online with Southwest. However, it appears on the website that my same exact itinerary is cheaper now that it was when I booked. So my question is what is the best way to rebook for the lower fare without the risk of losing the flights that I have? Should I just cancel and rebook? Or should I try changing the reservation even though I'm not changing dates or flight? I hope I didn't make it sound confusing. 
