You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I have planned to go for Science festival at Las Vegas, LAS. Can you please book a connected flight?

ASSISTANT: Sure, Please share your trip dates.

USER: Sure, my travelling dates are Feb 10 and Feb 12.

ASSISTANT: May I know your source airport code?

USER: My source airport code is OAK.

ASSISTANT: For booking we need your name, please mention it.

USER: Sure, I am Helen Gonzalez.

ASSISTANT: Sorry to say that, there are no flights available on the dates of your journey.

USER: Ok, no issues. Thank you.

ASSISTANT: Thanks for reaching us.