Hello.
user
Hello, how can I help you?
assistant
I am looking for a flight in a business class. Can you please help me to book a flight ticket from Washington?
user
May I know your desired travel dates please?
assistant
The travel dates are Jan 25 and Jan 27.
user
Can I know your airport codes please?
assistant
The source and destination airport codes are DCA and LAX.
user
May I know your name please?
assistant
My name is Barbara Hernandez.
user
Sorry to say, there is no flight on your desired travel dates.
assistant
It's ok, not a problem with  that. Thank you for your time.
user
Thank you for opting us.
assistant
You are welcome.
user