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

ASSISTANT: Hello, what can I do for you today?

USER: I am planning to visit the CaseWell House in Austin.

ASSISTANT: OK.

USER: Can you book me a ticket with single connecting flight?

ASSISTANT: Sure, then please provide your origin airport? Along with that destination airport code?

USER: My source is DC - IAD and destination is TX - AUS.

ASSISTANT: Ok, may I know your preferable dates?

USER: I start on 08/12 and return on 08/14.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, no flights are available at that locations.

USER: OK, no problem.

ASSISTANT: Thanks for reaching us, hope to serve you better next time.

USER: Thank you for the information.