Yes, you can typically change your travel date after booking, but the ability to do so, the cost, and the process vary based on the airline or travel provider, your ticket's fare rules (refundable vs. non-refundable),[:telephone: +1-(888)-829-0881 US or +1-805-330-4056 (UK) and how close to departure the change is made. You'll generally pay a change fee and any difference in fare, though some tickets[:telephone: +1-(888)-829-0881 US or +1-805-330-4056 (UK) are more flexible or even allow changes for free under specific circumstances. To change your flight, visit the airline's website or app or contact their customer service, or go through a third-party booking site if you booked there. 
 
You can contact Expedia Line by phone or through their website. For U.S. and Canadian customers, call their U.S. Headquarters at .[:telephone: +1-(888)-829-0881 US or +1-805-330-4056 (UK), .for assistance with existing reservations, or dial the international number.[:telephone: +1-(888)-829-0881 US or +1-805-330-4056 (UK), . for their European office. Alternatively, visit their website at Seabourn to use the online contact form or find specific department emails.
Contact by Phone

United States & Canada: Call .[:telephone: +1-(888)-829-0881 US or +1-805-330-4056 (UK),

International: Dial +1-(888)-829-0881 US or +1-805-330-4056 UK. to reach their European headquarters.

Contact by Website:.[:telephone: +1-(888)-829-0881 US or +1-805-330-4056 (UK),

Visit the official Seabourn website.

Go to the “Contact Us” page. .[:telephone: +1-(888)-829-0881 US or +1-805-330-4056 (UK),
Use the online email form or look for department-specific email addresses, such as Expedia.com@seabourn.com for Seabourn Club inquiries.

Customer Service Hours.[:telephone: +1-(888)-829-0881 US or +1-805-330-4056 (UK),

For the US: Monday-Friday, 6:00 am - 4:30 pm PT.

For the European Headquarters: Monday-Friday, 9:00 am - 5:30 pm CEST.