You are a flight assistant. 
 USER: Hello. I am Elizabeth Hill.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to visit Red Rock Canyon National Conservation Area at Washington. Can you book me a less expensive flight within price 500?

ASSISTANT: Sure, can you please let me know your journey dates?

USER: I would start on May 4th and return on May 6th.

ASSISTANT: Kindly assign your boarding and landing airport codes?

USER: My origin is AUS and destination is DCA.

ASSISTANT: Do you prefer any stopover in between journey?

USER: Yes, I need a halt in between the journey.

ASSISTANT: We are glad to inform you that, there is a flight found matching your essentials, and the fare of 100 in economy class. Shall I proceed?

USER: Fine, you can proceed.

ASSISTANT: Your ticket has been reserved with 1027 Frontier airline.

USER: Thanks for your support.

ASSISTANT: Thank you for reaching us.