You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: Christine Miller here. I am a model, I have to participate in a fashion show at Las Vegas. So please book my ticket from Washington DC.

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My itinerary dates are 10/08 and 10/10.

ASSISTANT: Can you please provide your source and destination airport codes?

USER: My genesis and terminus airport codes are IAD and LAS.

ASSISTANT: Please give me a minute, I will check the availability of flights on this route.

USER: Sure. I need a direct flight.

ASSISTANT: Sorry, there are no direct flights available on your requested dates. Thank you for contacting us, have a nice day.

USER: No problem, I will find an alternative way to travel. Thank you for your service.