Try this
- Identify the decision deadline and the information still missing. Send one clear message stating your fallback.
- Make the independent plan if the deadline passes, without pretending that silence was agreement to a shared alternative.
A worked example
“If we haven’t chosen by noon, I’ll go to the afternoon screening on my own. We can plan another outing later.”
An invented example to adapt, not a real exchange or a script you have to follow.
Before you leave it here
Keep the fallback practical rather than punitive. If the scheduling pattern needs a larger conversation, choose a separate time for that discussion.