You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to book a ticket from OAK to LAS, can you help me?

ASSISTANT: Sure, please provide me your planned trip dates.

USER: My planned dates are 10/23 and 10/25.

ASSISTANT: May I know your name please to proceed further?

USER: Myself Catherine White.

ASSISTANT: There are no flights available at this moment due to heavy bookings, White.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for choosing us, have a good day.