I booked flight and got booking details with TOTAL paid in USD, no break-down. Few days later, I called help center (they do answer very quickly and are very polite). Lady sent me receipt with break-down in EUR.
When I asked how much I should have paid in dollars - she named amount which is 40 less than what I paid so I had to open contact us request for USD invoice.

Is that a standard practice ? I do not see anything on the website warning me as consumer that buying in currency other than EURO will result in extra charges.
Had I gotten a detailed receipt in USD right when I booked - I would have had a chance to cancel and rebook (I think) under 24hr policy.

Yes, I charge in local currency when abroad. Never crossed my mind that major airline direct website will be playing conversion game without any type of consumer warning or proper choice.