Rachel: I've ordered shoes online but they've never arrived.
Samantha: When did you order them?
Paul: Did you contact the seller?
Rachel: A month ago...
Rachel: I did but they said the package had been shipped
Rachel: I don't know what to do
Paul: Did they give you a reference number?
Rachel: No 
Paul: They should
Samantha: Where did you order?
Rachel: On Amazon
Samantha: Then you should contact Amazon
Samantha: Don't worry they will help you
Rachel ordered shoes on Amazon a month ago but they haven't arrived yet. Samantha suggests her to contact Amazon on this matter.