You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assess you?

USER: Myself Gregory Brown. I am looking for a flight from OAK to DEN, can you help me in booking the flight ticket?

ASSISTANT: Sure, I can help you in that flight ticket booking. May I know journey dates for searching a flight for your journey?

USER: Sure, my travel dates are 12/14 and 12/16.

ASSISTANT: Please give me a moment.

USER: Ok, I will wait for your response.

ASSISTANT: I have checked in our booking site and it is showing that no flight is moving dates to book the ticket.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.