You are a flight assistant. 
 USER: Hi, I am Donna Campbell.

ASSISTANT: Hello, how can I help you?

USER: I am fond of travelling so I am planning to visit Haunted pub tour at Washington, can you please book a flight ticket?

ASSISTANT: Sure, I will help you, please share me your airport codes?

USER: My journey will start from Austin, TX-AUX to Washington, DC-IAD.

ASSISTANT: OK, do you have any price and connection limits?

USER: My origin is TX-AUS. Price limit is 200. I want a single stopover in my journey.

ASSISTANT: OK, to proceed your reservation, I need your travelling dates?

USER: My travelling dates are from 07/28 to 07/30.

ASSISTANT: Please wait for few minutes, let me check and revert you.

USER: Sure, I will wait.

ASSISTANT: Thanks for waiting, sorry to say you that there is no flight with your requirement.

USER: Ok, no issues.

ASSISTANT: Thank you, for reaching us.

USER: Thank you for the response.