Hello.
user
Hello. How can I aid you?
assistant
Please book a flight ticket on dates Sept 11 and Sept 13.
user
Sure, I can help you.
assistant
Thank you.
user
Please share me your airport codes.
assistant
My airport codes are ORD and DEN.
user
Do you need any break?
assistant
Yes, I need a connecting flight.
user
Is there any other  specification?
assistant
I need a ticket in business class.
user
May I know your name?
assistant
My name is Richard Roberts.
user
 We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.
assistant
That's ok, thank you for the response.
user
Thank you for reaching us.
assistant