You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Is this flight booking agency?

ASSISTANT: How can I assist you?

USER: I'm Justin Walker.

ASSISTANT: Yes, welcome to our agency.

USER: I have planned to visit Mount Rainier National park at Washington, could you please help me with booking a flight ticket from SFO?

ASSISTANT: Sure Justin, can I know the airport code of Washington?

USER: Airport code is DCA.

ASSISTANT: Can I know on which dates you are planning to travel?

USER: I would like to take off on 09/22 and return on 09/24.

ASSISTANT: Ok, wait a moment please.

USER: And I am looking for a direct flight.

ASSISTANT: Ok. Sorry, there are no direct flights on your route.

USER: That's ok, I will search for another alternate to complete my journey.

ASSISTANT: Ok.

USER: Anyways, thank you for your information.

ASSISTANT: You are welcome.