You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Jennifer White.

ASSISTANT: Do you need any help that I can do for you?

USER: I have a conference meeting at Los Angeles. Can you please help me in reserving the ticket from DEN to LAX?

ASSISTANT: Sure, may I know your preferable travel dates?

USER: I am planning my trip on Dec 11, and again I will return back on Dec 13.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: My depart time is afternoon.

ASSISTANT: Please let me know if you need any connecting flight.

USER: I am flexible with single connections.

ASSISTANT: Sorry, no flight has obtained on your journey dates to reserve a flight ticket.

USER: Not an issue, anyhow thank you very much for your service.

ASSISTANT: You are welcome and reach us any time if you need any help.