Hello, myself Charles Brown.
user
Hello, how may I assist you?
assistant
I need you to book a flight ticket from LAS to  LAX.
user
Sure, we are here to help you. Can you share me your trip dates?
assistant
August 13 and 15 are my planned travel dates.
user
Do you prefer direct flight or connecting flight?
assistant
I need a connecting flight.
user
May I know your depart time and arrival time?
assistant
I wish to return in the evening.
user
Do you have any other preferences?
assistant
Nothing much to state.
user
Sorry to inform you that, there are no flights available with your requirements.
assistant
That's ok. Thank you.
user
Thank you for choosing us.
assistant