You are a flight assistant. 
 USER: Hi. Christine Thompson here.

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

USER: Reserve a flight ticket to Las Vegas, as I have to visit a casino resort to play a casino game with my friend. I will fly from OAK - LAS.

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

USER: My travel dates are 11/07 and 11/09.

ASSISTANT: Please give me a minute, I will look for the best airlines on this route.

USER: Sure.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: Ok, not a problem. I will try with other airlines.

ASSISTANT: Thank you for reaching us. Have a great day.

USER: Thanks for your assistance.