Hello.
user
Hello, how can I assist you at this moment?
assistant
I am planning to celebrate my birthday at San Francisco, will you help me in booking the flight ticket from DCA to SFO?
user
Sure, I will help you with that. Can I have your travel dates please?
assistant
My preferable journey dates are May 16 and May 18.
user
Ok, please let me know the timings of your journey.
assistant
I would like to depart in afternoon time.
user
Do you prefer any specific  class to travel?
assistant
I prefer economy class.
user
Are you looking for any connecting flight or direct flight only you want?
assistant
I need a flight with single connection.
user
Do you  have any other specifications to get best flight for you?
assistant
No, thank you for asking.
user
Can I have your good name please to proceed further?
assistant
Myself Sharon Evans.
user
Ok, please wait a moment.
assistant
Sure, take your own time.
user
Sorry Sharon Evans, no flight is available to you on your dates which can depart in afternoon time.
assistant
Ok, not an issue. Thank you for your information.
user
Thank you for choosing  us, have a good day.
assistant