Hi.
user
Hello, how can I help you?
assistant
I am Donald Anderson want  to book a ticket with price under 500, can you help me in booking flight ticket from Washington to San Francisco?
user
Sure, may I know your planned travel dates?
assistant
Yes, I have planned to travel on 05/23 and return on 05/25.
user
Please share me your source and destination codes.
assistant
Sure, my airport codes are DC-DCA and CA-SFO.
user
Please wait for a while.
assistant
Ok.
user
Thanks for waiting, we found an airline: Delta, flight number: 1018 with a single connection and price is 100.
assistant
Ok, please proceed with booking.
user
Your flight ticket has been reserved.
assistant
Thank you.
user
Thank you for choosing us.
assistant