Hello.
user
Hello, how can I guide you for today?
assistant
I am David Phillips. I want to book a flight ticket to meet my friends in Washington. Could you help me in booking a flight ticket?
user
Can you please share on what dates you are willing to travel?
assistant
I would like to fly on 05/14 and return on 05/16.
user
Can you please provide your nearest source and destination airport codes?
assistant
My source is Las Vegas, NV - LAS and destination is DC - IAD.
user
Sorry, there is no flight available on  your requested dates.
assistant
Not an issue. Thank you for your service.
user
Thank you for contacting us, have a nice day.
assistant