Would you like to mail it by air or sea ?
neutral
user
Hmm ... How long will it take to mail things to the USA by air ?
neutral
assistant
About 10 days . You can send it express mail if you need it faster . It will only take three or four days .
neutral
user
I want to send it by express mail . The faster , the better .
neutral
assistant
OK , the postage is 275 yuan .
neutral
user
Here you go .
neutral
assistant
This is the receipt , please keep it . Have a good day .
neutral
user
Thanks .
happiness
assistant