You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER:  I am Dennis Turner want to meet my friends at DC-DCA from CA-OAK. Can you book a ticket?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My travel dates are 06/15 and 06/17.

ASSISTANT: Do you need halt in between your journey?

USER: I need a connecting flight.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there are no flights found with your given dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.