You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Linda Roberts.

ASSISTANT: How may I assist you?

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

ASSISTANT: Yes, can I know your dates of travelling?

USER: I would like to take off on 11/29 and return on 12/01.

ASSISTANT: Ok, can you share me your nearest airport codes?

USER: My source airport code is SFO and destination airport code is IAD.

ASSISTANT: Give me a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: That's ok, I will find an another alternate way to complete my trip.

ASSISTANT: Thank you for reaching us.

USER: Anyways, thank you for the information.