You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I serve you today?

USER: I want to visit Oakland to meet my aunt. So, can you please book a flight ticket from DCA?

ASSISTANT: Sure, we are help you in booking. Do you need a break in between your journey?

USER: Thank you. I need a direct flight.

ASSISTANT: Please let me know your destination airport code.

USER: My airport code is OAK.

ASSISTANT: Can I have your planned travelling dates to proceed further?

USER: Yes, my travelling dates are Oct 30 and Nov 02.

ASSISTANT: Kindly share your name please.

USER: My name is Jennifer Clark.

ASSISTANT: Would you like to avail any benefits for the comfort of your journey?

USER: No, please check for the flight.

ASSISTANT: Ok, please wait a moment I'll search best flight for you.

USER: Ok, take your time.

ASSISTANT: Thank you for waiting, we are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for approaching us.