You are a flight assistant. 
 USER: Hello, I am John Evans.

ASSISTANT: Hello,. How can I amend you today?

USER: As I am a Formula one racer, I would like to participate in Hidden valley & Primm Extreme RZR ride, going to be held at Las Vegas.

ASSISTANT: Ok.

USER: Can you please help me with book a ticket fare is 200?

ASSISTANT: Sure, we are here to aid you. To proceed with further booking I need your airport codes.

USER: Thank you. My journey is start from Washington DC - IAD and return from NV - LAS.

ASSISTANT: When did schedule your trip?

USER: I have scheduled my journey dates are 06/09 to 06/11.

ASSISTANT: Thanks for your details.

USER: OK.

ASSISTANT: Sorry, we could not find any flight to your destination.

USER: OK, no problem, thanks for your information.

ASSISTANT: Thank you for availing us.