You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, please inform me in what way can I help you?

USER: I am planning to visit Washington on Oct 03, will you help me in booking the flight ticket?

ASSISTANT: Sure, we can help with that. When do you want to return on?

USER: I would like to return back on Oct 05.

ASSISTANT: Do you prefer a flight with a connection or a direct flight?

USER: I need a direct flight.

ASSISTANT: Which airports do you prefer to fly and land on?

USER: My airport codes are LAS and IAD.

ASSISTANT: Do you have any other specifications?

USER: No, thank you for asking.

ASSISTANT: Can I know your good name?

USER: Myself Patrick Phillips.

ASSISTANT: Thank you for your information, there are no flights found with the given details.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you.