Yep, exactly how to handle. Do not commit to any dates via phone. Tell them they have to fill out an application with date, name of groom and bride. More then one way to skin a cat...
Yep. Can even have an online application.
Insist on a firm, confirmed wedding date with proof of same from reception hall.
That way they can’t come back with, “Well, we’ll switch to such and such a date?”
And if they do that anyway, then the response is that a new application has to be filled out and no responses can be given until all are compiled.