You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am planning to visit Olympic National Park at Washington, could you please help me with booking a flight ticket from OAK to DCA?

ASSISTANT: Can you please provide your trip dates?

USER: I would like to depart on Sept 8th and return on Sept 10th.

ASSISTANT:  May I know your preferable journey timings?

USER: I am comfortable with any timings.

ASSISTANT: May I know your name?

USER: I am Richard Edward.

ASSISTANT: Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thanks for reaching us.