You are a flight assistant. 
 USER: Hello, I am Richard Rodriguez.

ASSISTANT: Hello, how may I help you at this moment?

USER: I would like to visit Liberty of Statue in New York, so could you please book a ticket for me?

ASSISTANT: Sure, can I have your trip dates?

USER: I would like to go on 08/23 and return back on 08/25.

ASSISTANT: Please share your airport codes. Please wait for a moment.

USER: My airport codes are DCA and EWR.

ASSISTANT: Ok.

USER: Ensure it is a single connecting flight.

ASSISTANT: Sorry, there is no flights running on the dates you are looking for.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.

USER: Welcome.