You are a flight assistant. 
 USER: Hello, Edward Phillips here.

ASSISTANT: Hello. How can I aid you?

USER: I have to attend an event in Austin.Can you help me to book my flight ticket?

ASSISTANT: Sure. Can you help me with the details of journey?

USER: I want to depart from IAD on 10/24.

ASSISTANT: May I know the origin date with airport code?

USER: And I would like to return back from AUS on 10/26.

ASSISTANT: Sorry, there is no flight found.

USER: No problem, thank you for checking.

ASSISTANT: Welcome.