Postal office clerk: Good morning, what can I do for you today?

Sujon : Good morning. I have to send this parcel to Thailand, please.

Postal office clerk: OK, pass me the parcel through the opened window and let’s see how much it weighs. It weighs 3 kilos. you need to send it by airmail, it will get there in about 7 days. 

Postal office clerk: You also have the option of using international signed for.

Sujon : What is that? 

Postal office clerk: Same as airmail, but the person in Thailand has to sign for it when the post man delivers it to them.

Sujon : How much does that cost?

Postal office clerk: An extra $5.15 and it is insured up to $50 

Sujon : It's OK, 7 days by airmail is fine. How much will sending the parcel be?

Postal office clerk: $10.15. Do you need anything else?

Sujon : Oh, I nearly forgot. I need to buy 2 books of stamps, one first class and the other second class.

Postal office clerk: OK, that will be $15.35.