You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to visit Botanical garden at Washington, DC - DCA. Can you please book me a flight ticket?

ASSISTANT: Sure, may I know your good name please?

USER: Kimberly Nelson is my name.

ASSISTANT: Could you please provide me your travelling dates?

USER: My travelling dates are departure on 03/25 and return on 03/27 to Atlanta, GA - ATL.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Thanks for waiting, unfortunately there is no flight on your route.

USER: Ok, no problem. Thanks for your service.

ASSISTANT: Thank you so much for choosing us. Have a nice day.