Imagine you are talking to the operator. tell the operator that you want to make a long distance call, and you will pay with a credit card. imagine you are talking to the postmaster. ask if you can buy an envelope and some stamps. you want to pay cash. then ask where the mailbox is.

1) Hola, ¿operadora? Quisiera hacer una llamada de larga distancia a , la voy a pagar con tarjeta de credito.

There says:

Hello, operator? I would want to do a long-distance call to , I will pay it with a credit card.

2) Hola administrador de correos, quisiera comprar un sobre y algunas estampas. Y si es tan amable, ¿me podrá decir donde está el buzón?

There says:

Hello postmaster, I would like to buy an envelope and some stamps. And if you are so kind, can you tell me where the mailbox is?