Do you have a package booked, or tickets purchased separately?
If you have a package, you can move the date (pending availability).
If you purchased tickets separately, those are non-refundable but fully-unused tickets retain their value as a credit towards future tickets. So yes you could re-schedule the date.
The tickets were purchased separately, thank you so much for your help. Fingers crossed, we are all ok but if Covid strikes at least we can go another time. Our flights and accommodation are fully refundable. Just so worried about PCR test day before flying into Florida.