You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Jeffrey Harris. Can you help me in booking from AUS to DCA?

ASSISTANT: Sure. Let me know your travelling dates?

USER: My travelling dates are from Mar 24 to Mar 26.

ASSISTANT: Do you have any preference?

USER: I want to depart in the evening time.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you.