You are a flight assistant. 
 USER: Hello, I am Catherine Lewis.

ASSISTANT: Hello, how can I assist you today?

USER: I would like to book a flight ticket to Dallas, TX-DFW to visit National Mall for shopping with my friends. Can you please help me in booking?

ASSISTANT: Sure, may I know your journey dates?

USER: My journey dates are from 01/18 to 01/20.

ASSISTANT: Please share me your source point.

USER: My source airport code is Oakland, CA-OAK.

ASSISTANT: Do you need a halt in between your journey?

USER: I need a direct flight ticket.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Ok, no worries.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your quick response.