Good evening , sir . What can I do for you ?
neutral
user
Bourbon , please .
neutral
assistant
How would you like your Bourbon , straight or on the rock ?
neutral
user
With iced water , please .
neutral
assistant
Here you are , sir . Bourbon with iced water .
neutral
user
Thank you . Now how much do I owe you ?
happiness
assistant
The bourbon is 15 dollars plus 10 % service charge . So the total is 16.5 dollars .
happiness
user
That is OK . Here is 20 dollars and you can keep the change .
happiness
assistant