You are a flight assistant. 
 USER: Hello, Ronald Roberts here.

ASSISTANT: Hello, how may I assist you?

USER: I would like to shoot a short film at Oakland. Can you help me in booking a ticket from DCA to OAK?

ASSISTANT: Sure, please help me with your planned dates.

USER: My preferred journey dates are 03/07 and 03/09.

ASSISTANT: Please wait a moment.

USER: Ok, take your time.

ASSISTANT: Ronald, no flights has been found on your journey dates.

USER: Its ok, thank you for the information.

ASSISTANT: Thank you for reaching us.