Try this
- Pick a fallback landmark that remains usable if phones fail or the entrance becomes crowded.
- Agree on a time or waiting rule for using it. Avoid a fallback that requires entering a ticketed area one person cannot access.
A worked example
“If we cannot find each other, meet beside the ticket desk.”
An invented example to adapt, not a real exchange or a script you have to follow.
Before you leave it here
Choose a place both people can identify without needing another message.