async def create_reservation(self):
    prio = self.args.prio

    fltr = {}
    for pair in self.args.filters:
        try:
            k, v = pair.split("=")
        except ValueError:
            raise UserError(f"'{pair}' is not a valid filter (must contain a '=')")
        if not TAG_KEY.match(k):
            raise UserError(f"Key '{k}' in filter '{pair}' is invalid")
        if not TAG_KEY.match(v):
            raise UserError(f"Value '{v}' in filter '{pair}' is invalid")
        fltr[k] = v