You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know how best I can help you today?

USER: I am planning to visit Denver, can you please book me a ticket from LAX to DEN?

ASSISTANT: Sure, we are mirthful to assist you in booking. Please let me know if you need a connecting flight in between your journey.

USER: Yes, I prefer connecting flight for this trip.

ASSISTANT: Could you please share if you have any other comforts in between your journey?

USER: I prefer to return in evening flight.

ASSISTANT: Kindly mention your planned travelling dates to proceed further.

USER: My planned dates of journey are June 27 and June 29.

ASSISTANT: Can I have your name please?

USER: My name is Lisa Johnson.

ASSISTANT: Ok, please wait a moment I'll check and revert  you.

USER: Sure, take your own time.

ASSISTANT: Thank you for waiting, we are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: Ok, not an issue.

ASSISTANT: Thank you for availing us.

USER: Thank you for providing information.