You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Myself Nicholas Turner.

ASSISTANT: Yes, Nicholas.

USER: I want to book a ticket to Las Vegas to meet my sister.

ASSISTANT: Ok, may I know your full journey details please?

USER: My airport codes are from DTW to LAS.

ASSISTANT: Ok.

USER: My journey dates are from 09/27 to 09/29.

ASSISTANT: Nicholas, please give me a moment.

USER: Sure.

ASSISTANT: Sorry for inconvenience, there is no flight available at your requested dates.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for reaching us.