Good morning . What can I do for you ?   Christmas Day is coming . I want to buy several postcards to send to my family and friends . Can you recommend me some ?   Of course . How about these postcards ? They are specially designed for Christmas .   These postcards are great . I want to buy a dozen with different pictures .   No problem . You can choose what you like .   How much is a postcard ?   A postcard costs you five yuan . A dozen postcards cost you 60 yuan .   OK . Here is the money . Thank you very much .   You are welcome . 