Can I help you ?
neutral
user
How much is this pen ?
neutral
assistant
Ten Yuan .
neutral
user
And how much is this pencil ?
neutral
assistant
One Yuan .
neutral
user
Here's fifteen Yuan .
neutral
assistant
And here's your change . Please check if it is correct .
neutral
user
OK , that's right .
neutral
assistant
Welcome to come again .
happiness
user
OK .
happiness
assistant