The context of the following conversation is The post office was busy, so Skylar helped forward the mail.:
Skylar says Hey how are you?.
The friend responds I'm alright, how are you? Did you manage to send the mail?.
Skylar responds The post office was very busy today, but don't you  worry!.
The friend responds You know that letter has to be posted by Tuesday..
Skylar responds I am well aware of that, that is why I forwarded the letter for you..
The friend responds Thank you very much, I don't know what I would do without you..