Good afternoon .
neutral
user
Good afternoon . Can I help you ?
neutral
assistant
I've got this important letter to send to Hainan . Can I send it by registered mail ?
neutral
user
Certainly .
neutral
assistant
How much will I have to pay ?
neutral
user
Two yuan , please .
neutral
assistant
Here are the letter and the money .
neutral
user
Wait a moment . It seems that your letter is overweight . Let me weight it .
neutral
assistant
Is it overweight ?
neutral
user
I'm afraid it is . So you will have to pay two yuan extra . The total charge is four yuan .
sadness
assistant
All right . Here is the money .
neutral
user
Here are the stamps and your receipt .
neutral
assistant
What shall I do with the receipt ?
neutral
user
You can keep it until the addressee tells you that the letter has been delivered . It is the proof that you sent the letter if it fails to arrive .
neutral
assistant
Thank you .
happiness
user
Not at all .
happiness
assistant