Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to change amtrak reservations [title] Change your ticket delivery method. [substeps] You can choose to have your tickets sent by mail or arrange to have them ready for pick-up at an amtrak kiosk, amtrak station, or amtrak vending machine. [title] Modify the times or dates of your reservation based on your new traveling plans.

Ending1: [substeps] You should change your ticket delivery method weekly by changing your dates from 7 to 7 a.m. or bi-weekly by changing your dates from 4 a.m. Ending2: [step] You may change your schedule on the amtrak website to allow it to have certain times and date changing arrangements as well. [substeps] For example, if you're going to amtrak this weekend, don't be surprised if your first couple of stops are extremely late. Ending3: [substeps] You have your departure time stamped and your travel dates during the day. You can cancel last-minute reservations that are later than the dates on your calendar. Ending4: [substeps] There are no penalty fees for changing a reservation. You may be required to pay the difference in cost if your new, updated ticket has a higher rate.

Answer format: ending1/ending2/ending3/ending4