I am sixt plat and the airport was DUS

I wrote in the comment field that I want to have a diesel and
the guy offered me bclass, passat or the mentioned a6. obviously I went for the a6, which was manual by the way, so pdmr rather than ldar.
The parkhouse was full, so I guess he didnt really care, it was sunday afternoon and because of the tariff I had to bring the car back to DUS anyway on Tuesday morning.
However, he didnt offer me the 730d and R320cdi which were also in the parkhouse