MarsAir

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Description: **Description:** When the user selects a return date that is chronologically before the departure date (e.g., Departing "December (next year)" → Returning "July"), the application should display the invalid schedule error. Instead, it shows *"Sorry, there are no more seats available."* **Steps to Reproduce:** 1. Navigate to the MarsAir home page 2. Select **"December (next year)"** from Departing 3. Select **"July"** from Returning 4. Click **Search** **Expected Result:** `"Unfortunately, this schedule is not possible. Please try again."` **Actual Result:** `"Sorry, there are no more seats available."`