You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Please book a flight ticket from LAS to OAK?

ASSISTANT: Sure, let me know your trip dates please?

USER: My journey dates are Apr 25 and Apr 27.

ASSISTANT: Is there any timings preference?

USER: I need a direct flight.

ASSISTANT: Ok, but is there any timings preference?

USER: No.

ASSISTANT: Any other requirement to be met?

USER: No.

ASSISTANT: Can you mention your name to proceed further?

USER: I am Kenneth Gonzalez.

ASSISTANT: Sorry, no flights found as per your requirement.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for contacting us.