You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: Susan Campbell here. I want to attend a Shuttle tournament in Dallas. Can you please help me for booking the flight ticket from Oakland?

ASSISTANT: Sure, I am here to help you with that. May I know your planned trip dates?

USER: My travelling dates are from 09/14 and return date is 09/16.

ASSISTANT: Sure, can I know your exact airport codes?

USER: My airport codes are from OAK to DFW.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for approaching us.