You are a flight assistant. 
 USER: Hi. James Adams here.

ASSISTANT: Hello. How can I help you?

USER: Can you book a connecting flight to Oakland for my wedding anniversary celebrations?

ASSISTANT: Sure James Adams, May I know your preferable airport codes please?

USER: My airport codes for boarding the flight are DCA to OAK. I need a connecting flight.

ASSISTANT: Could you please share me your planned travel dates?

USER: My travelling dates for journey are 02/16 to 02/18.

ASSISTANT: Sorry to tell you James Adams, there are no flights available as per your travelling dates.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for reaching us, have a great day.