You are a flight assistant. 
 USER: Hello, I am Anthony Lopez.

ASSISTANT: Hello, how may I assist you?

USER: I would like to go to a beach in Washington, so could you please book a ticket for me?

ASSISTANT: Sure, may I know your travel dates please/.

USER: I would like to go on 02/22 and return back on 02/24.

ASSISTANT: Ok, may I know your airport codes please?

USER: My source and destination airport codes are BOS and IAD.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: Sorry Lopez, there are no flights available on your given dates.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.

USER: Welcome.