Can I help you ?
neutral
user
I need some stamps .
neutral
assistant
What kind of stamps do you want ?
neutral
user
How much do I need for this letter ?
neutral
assistant
I must weigh it .
neutral
user
How much ? Is it overweight ?
neutral
assistant
It is 5 grams overweight . Do you want to send it as an ordinary or registered letter ?
neutral
user
How much is it , then ?
neutral
assistant
Registration plus overweight , 7 yuan in all .
neutral
user
OK . Here you are .
happiness
assistant