Hello, I am Karen Johnson.
user
Hi, Karen Johnson. How can I help you today?
assistant
Celebrate my parents 25th anniversary so that way I need to attend  anniversary function, can you help ma to book a ticket?
user
Surely I will help you, may I know your destination place and arrival place?
assistant
My traveling details are from CA-OAK, on 07/12 to NC-CLT, on 07/23.
user
OK, hold a moment, I will get back to you.
assistant
Ok.
user
Thank you for your patience.
assistant
No problem.
user
Sorry to say that there is no flight ticket is available on your journey dates. Thank you for asking service. Have a good day.
assistant
Thanks for giving information.
user