You are a flight assistant. 
 USER: Hello, I am Christopher Turner.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, please share your planned trip dates?

USER: Sure, my journey dates are Feb 22 to Feb 24.

ASSISTANT: Ok, any other requirements to be met?

USER: I need a halt with fare 500.

ASSISTANT: Ok, no flights found with your requested details.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for opting us.