You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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: Sure, may I know your planned travel dates?

USER: I would like to depart on Nov 16th and return on Nov 18th.

ASSISTANT: May I know your connection limit?

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: Make sure that my depart time must be afternoon.

ASSISTANT: May I know your good name?

USER: I am Virginia Garcia.

ASSISTANT: Please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to say that, no flights were found with your given details.

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

ASSISTANT: Thank you for reaching.