You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: Can you please help me in booking a flight ticket from Las Vegas, LAS to Charlotte, CLT?

ASSISTANT: Sure, let me know your travelling dates.

USER: My journey dates are from Dec 10 to Dec 12.

ASSISTANT: Do you want connecting flight?

USER: I need a flag stop in between my journey.

ASSISTANT: Do you have any other requirements?

USER: My return time is evening.

ASSISTANT: May I know your name please?

USER: My name is David Taylor.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: Thank you for opting us.