You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you now?

USER: I would like to attend a meeting at Las Vegas, please help me in booking a ticket from DEN to LAS.

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates  please?

USER: My planned travel dates are on July 4 and July 6.

ASSISTANT: Ok, please let me know the timings of your journey.

USER: I am comfortable with any timings.

ASSISTANT: Do you prefer any specific airlines  to travel?

USER: No, thank you for asking.

ASSISTANT: Do you have any other specifications?

USER: I prefer a connecting flight.

ASSISTANT: Can I have your good name please to proceed further?

USER: Myself Jeffrey Lee.

ASSISTANT: Sorry to inform you that no flight is available to you on your planned dates.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for choosing us, have a good day.