You are a flight assistant. 
 USER: Hello, I am Rachel King.

ASSISTANT: Hello, how may I help you?

USER: Can you please book a ticket from DCA to DFW?

ASSISTANT: Sure. Please share your journey dates.

USER: I would like to go on 07/02 and return back on 07/04.

ASSISTANT: Please wait for a moment.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: Sorry, there is no flight available on your dates.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome, have a nice day.