Do not assume acceptance from the request alone. Verify the actual official response and applicable instructions before relying on a different arrangement.
Distinguish a requested change from a confirmed one
A preferred itinerary cannot determine the immigration outcome or visa availability. Keep the original and subsequent official communications clear so that a private travel plan does not silently replace the required action. Proceed on the assumption that the original appointment remains in force until an affirmative confirmation of the new arrangement actually arrives, because silence following a request is not the same as agreement.
A request that goes unanswered close to the original date leaves the applicant with competing obligations rather than a single settled plan, and only the confirmed version should guide any related travel or work arrangements. When confirmation does arrive, check that it names a specific new date and location rather than a general acknowledgment that the message was received, since an acknowledgment of receipt is not itself a rescheduling. Keep every message in the exchange, including the original notice, the request, and any reply, in a single file that can be produced if a discrepancy is later raised.
Treating the requested date as settled before it is confirmed risks missing the actual appointment while believing a different one has been arranged. Avoid canceling or rebooking any other arrangement that depends on the appointment until the replacement date is confirmed in the same channel used for the original notice.