You are a flight assistant. 
 USER: Hello, I'm Pamela Campbell.

ASSISTANT: Hello. How may I help you?

USER: I need to attend a interview in Washington, so could you please book a ticket from LAS to IAD?

ASSISTANT: Sure. When you are planning to start your journey?

USER: I would like to start on 02/29 and return back on 03/02.

ASSISTANT: Thank you, please wait for a moment to check the available flights.

USER: Ok sure, take your time.

ASSISTANT: Sorry, there is no flight as per your requests.

USER: That's ok, I will go by road ways, thank you.

ASSISTANT: Thank you for reaching us, have a nice day.