Hi! I understand you're experiencing an issue where the destination city switches and the calendar dates change randomly when you try to reserve a seat in the Breeze Airways app on your Macintosh with OS X 10.15. That sounds unusual, so I want to help you get it sorted out.

Before we dive into steps, can I ask:
- Are you using the Breeze Airways website or the app for these reservations?
- Have you noticed if this happens after selecting certain flights or dates, or is it completely random?
- Are you logged into your Breeze account when making these reservations?

Meanwhile, here are some initial things we can try to troubleshoot this:

1. Clear Browser Cache and Cookies (if using the website):
Sometimes stored data can cause weird behavior. You can clear cache by:
- On Safari: Go to Safari > Preferences > Privacy > Manage Website Data > Remove All.
- Then restart Safari and try again.

2. Update or Reinstall App (if using app):
Make sure your Breeze Airways app is the latest version. Try deleting and reinstalling the app from the Mac App Store to reset any glitch.

3. Check for System Date and Time Settings:
On your Mac, if date and time are set incorrectly, it can lead to odd booking behavior. Check by:
- Going to System Preferences > Date & Time, and ensure "Set date and time automatically" is checked.

4. Try Booking in a Private/Incognito Browser Window:
This avoids extension or cookie interference and can help identify if it’s browser-related.

If after these steps the problem persists, let me know. It might be related to how the Breeze system is interpreting your session or a bug that might require us to escalate or check for any ongoing system issues.

Also, if you made any partial reservation or have a booking reference, it might help to review that reservation directly via “My Trips” on Breeze’s site or app to change or confirm your seats and flights1.

Let me know what you find from these, and we can take the next steps together! Are you satisfied with the solution ideas so far?