You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: I am Brandon Brown.

ASSISTANT: Yes, Brown.

USER: Please book a ticket from Las Vegas to Los Angeles under 5000 fare limit..

ASSISTANT: Sure, may I know your respective airport codes please?

USER: Sure, LAS and LAX are my respective airport codes.

ASSISTANT: Can you please provide me your planned travel dates?

USER: Planned travel dates are 11/21 and 11/23.

ASSISTANT: Ok, please wait for a while. Sorry to inform you that there are no flights available for you on those dates.

USER: Ok, not a problem. Thanks for the information.

ASSISTANT: Thank you for reaching us.