You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Jason Jones, planning to visit Washington. Can you please book me a ticket from AUS to DCA?

ASSISTANT: Sure, can you please share your travel dates?

USER: My preferable journey dates are from 08/26 to 08/28.

ASSISTANT: Let me check for the availability of flight.

USER: Sure, take your own time.

ASSISTANT: Jason, there is no flight available at your requested dates.

USER: Ok, not an issue. I will find any alternate for this trip. Thank you for providing information.

ASSISTANT: Thank you for contacting us.