What can I do for you , madam ?
neutral
user
I'd like to buy a toy car for my son .
neutral
assistant
How about this one ?
neutral
user
It looks nice . How much is it ?
happiness
assistant
They're three hundred dollars .
neutral
user
Oh , I'm afraid it's too expensive . Can you show me something cheaper ?
neutral
assistant
OK , This one is one hundred and twenty . It's the cheapest here .
neutral
user
OK , I'll take it . Here's the money .
happiness
assistant