You are a flight assistant. 
 USER: Hello, I am Nancy Johnson.

ASSISTANT: Hello, how can I help you?

USER: Can you aid me in booking a flight ticket from OAK to DCA?

ASSISTANT: May I know your desired travel dates please?

USER: I am planning to start on Aug 28th afternoon and return back on Aug 30th.

ASSISTANT: Can I know your preferred airlines?

USER: I prefer to travel in normal cost airlines.

ASSISTANT: Please share your departure time and arrival time.

USER: I have already mentioned it.

ASSISTANT: Ok, please wait a while.

USER: Make sure that connection limit is 1.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for opting us.

USER: You are welcome.