You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I abet you today?

USER: I need to visit flower festival at Oakland, CA - OAK. Can you please book a flight ticket from Washington, DC - DCA?

ASSISTANT: Sure, please let me know your preferable travelling dates to proceed further.

USER: 07/12 and 07/14 are my travelling dates.

ASSISTANT: Do you need a lay by in between your journey?

USER: Yes, I need a halt.

ASSISTANT: Just a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, unfortunately there are no flights found with your requested dates.

USER: Ok, no issues.

ASSISTANT: Thanks for approaching us.

USER: Thanks for your information.