You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am planning for a holiday trip with my friend to Dallas & Fort Worth, can you help me in booking my ticket?

ASSISTANT: Sure. May I know your journey dates?

USER: My airport codes are from CA-OAK to TX-DFW and my travel dates are from 09/25 to 09/27.

ASSISTANT: Could you please tell me your name?

USER: Myself Benjamin Moore.

ASSISTANT: Benjamin, please wait for a moment. Sorry to inform you Benjamin, there is no available ticket at your requested dates.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.