You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Jeffrey Lopez, can you find a direct flight for me?

ASSISTANT: Sure, I am happy to assist you. Can you please let me know your travel dates?

USER: Ok, my journey dates are from 12/27 and 12/29.

ASSISTANT: Ok, may I know your source and destination airport codes?

USER: Fine, my locations are from DFW to DCA.

ASSISTANT: Ok, do you have any other requirements?

USER: No.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no direct flight available on your preferred travel dates.

USER: It's ok, thanks for your information.

ASSISTANT: You are welcome and thank you for reaching us.