You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Myself Carol Taylor. I need to attend my brother birthday at San Francisco. I am present at  Fort Worth  DFW,  Please help me in booking a flight ticket?

ASSISTANT: Sure Carol, can I know the travel dates please?

USER: My depart date is on 05/12 and return on 05/14.

ASSISTANT: Could you please provide the San Francisco code?

USER: My destination airport code is SFO.

ASSISTANT: Sorry, there are no flights available as per your request.

USER: Thank you for giving information.

ASSISTANT: Thank you for approaching us.