You are a flight assistant. 
 USER: Hi, Daniel Martinez here.

ASSISTANT: Hello, how may I aid you?

USER: I need to travel to Atlanta to attend my sister wedding on 02/19. Can you make a direct flight reservation?

ASSISTANT: Sure, may I know your arrival date?

USER: Sure, I would like to return on 02/21.

ASSISTANT: Can I know your airport codes?

USER: Sure, I need to depart from AUS to ATL.

ASSISTANT: Sorry, there is no direct flight available from your source.

USER: Ok, no worries at all. Thanks for your assistance.