Hello.
user
Hello, how can I support you today?
assistant
 I am Shirley  Johnson. I want to book  a ticket to CA-OAK  to meet my friends. Can you book a direct flight?
user
Sure, may I know your source point?
assistant
I will depart from IL-ORD.
user
Please share me your travelling dates.
assistant
My travelling dates are 12/20 and 12/22.
user
Sorry to say that, no flights were found with your given details.
assistant
 Ok, thank you for your response.
user
Thank you for opting us.
assistant