You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I assist you?

USER: As I am a Doctor, I want to attend an emergency surgery in Las Vegas, NV - LAS so I need a direct flight. Can you please be my helping hand?

ASSISTANT: Sure, May I know the destination code?

USER: My boarding point is from Washington, DC - IAD.

ASSISTANT: Please help me with your journey dates.

USER: I want to move on 11/06. And I intend to return on 11/08.

ASSISTANT: Can I get your name?

USER: I am Joseph Johnson.

ASSISTANT: Thank you, Please give a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your dates.

USER: Ok, not an issue. Thanks for the information.

ASSISTANT: Thank you for availing us.