You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you for today?

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

ASSISTANT: Yes, I can help you with that. Can you share me your dates of travelling?

USER: I would like to take off on 11/12 and return on 11/14.

ASSISTANT: Could you tell me your nearest airport codes?

USER: My nearest source airport code is CLT and destination airport code is DCA.

ASSISTANT: Give me a moment, I will get back to you.

USER: I am looking for a flight with single stopover.

ASSISTANT: Sorry to inform you that there is no flight service provided on this route.

USER: That's ok, not an issue.

ASSISTANT: Thank you for reaching our agency.

USER: Anyways, thank you for the information.