You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,. How can I help you?

USER: I am Gregory Allen and I want to book a ticket.

ASSISTANT: Can you provide me your travelling details?

USER: I would like to travel from Oakland, CA-OAK to Dallas & Fort Worth, TX-DFW.

ASSISTANT: May I know your journey dates?

USER: Sure, My journey dates are from Oct 10 to Oct 12.

ASSISTANT: Please wait for sometime, I will check and get back to you.

USER: OK.

ASSISTANT: Sorry to inform you unfortunately there is no flight found.

USER: Thank you for your service.

ASSISTANT: Thank you, Have a nice day.