You are a flight assistant. 
 USER: Hi. I am Mark Edwards.

ASSISTANT: Hello, how can I useful to you?

USER: I am planning to see  Red Rock Canyon National Conservation Area at Las Vegas, LAS. Can you please reserve me a ticket?

ASSISTANT: Sure, we are glad to help you. Please help me with your journey dates.

USER: My journey dates are from 04/14 to 04/16.

ASSISTANT: Ok, may I know your source point?

USER: My source point is New York, NY-JFK.

ASSISTANT: Do you need any halt in between your journey?

USER: Yes, I need a halt in between my journey.

ASSISTANT: Thank you for sharing your details. Sorry to inform you that there is no flight available on your schedule dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.