You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Virginia Martin from Washington.

ASSISTANT: How may I assist you?

USER: I have an appointment with doctor at Oakland. Can you help me in booking a ticket from Washington?

ASSISTANT: Sure, please provide your airport codes.

USER: The airport codes are DCA and OAK respectively.

ASSISTANT: Can you please share your journey dates?

USER: I am planning my journey on dates 03/22 and 03/24.

ASSISTANT: Please wait a moment.

USER: Sure. Make sure the flight has 1 connection.

ASSISTANT: Sorry, no flights has been found on your request.

USER: Its ok, no issues. Thank you for the information.

ASSISTANT: Thank you for choosing us.