You are a flight assistant. 
 USER: Hi, my name is Jonathan Clark.

ASSISTANT: Hello, how may I aid you today?

USER: I want to book a flight ticket to attend my father's retirement celebrations in Oakland from Washington, DC - DCA.

ASSISTANT: Ok, please provide your travel dates.

USER: My trip dates are from 08/22 to 08/24.

ASSISTANT: May I know your landing point?

USER: I want to reach to CA - OAK.

ASSISTANT: Do you have any specifications?

USER: I need a connection in between my journey.

ASSISTANT: Ok, please wait I will check the availability of flights and revert you in a moment.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your preferable dates.

USER: Ok, thanks for your information.

ASSISTANT: Thank you for reaching us.