Your travel options
For a covered cancellation, the airline must offer the applicable choice of reimbursement or rerouting. Assistance while waiting is separate from a compensation claim.
When you were told
Keep the notification showing when you learned about the cancellation. Notice given at least 14 days before departure and qualifying alternative arrangements can affect compensation eligibility.
What to send
Provide the original booking, cancellation message and any replacement itinerary. Extraordinary circumstances and the actual arrival under rerouting also need review.