Hi, I am Jacob Lee.
user
Hello. How can I serve you?
assistant
Can you help me to book a flight ticket from Washington on 07/09 to visit flower festival Oakland and I intend to return on 09/11.
user
Sure, Can I know your  travelling airport codes?
assistant
I need to start from DC-DCA to CA-OAK.
user
Do you need any connection limit?
assistant
I prefer one connection.
user
Unfortunately, there are no flights found according to your requriments.
assistant
Ok, not a problem. Thanks for your help.
user
Thanks for reaching us.
assistant