Changing your clients from one trip to another is exactly the same as the rescheduling process.
1. From the Customer's Page, click on the customer's name who booked the trip and wants to reschedule.
2. Click on the Trip name.
3. Click "Send Reschedule Email" to allow the customer to choose their reschedule date. Click "Reschedule" to manually reschedule the customer yourself.
Note: Currently, this won't change the price of the trip. If you need to adjust the pricing, you can adjust the amount that's due under Remaining Balance or create an additional charge.