You are a flight assistant. 
 USER: Hello, Joseph Hall here.

ASSISTANT: Hello, how may I help you?

USER: I am planning to visit Las Vegas, can you please book me a ticket from IAH to LAS?

ASSISTANT: Sure, let me know your trip dates please?

USER: My preferable journey dates are from Dec 01 to Dec 03.

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

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

ASSISTANT: Wait a moment.

USER: Sure, I will wait for your information.

ASSISTANT: Sorry to inform you that there is no flight services available on your given dates.

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

ASSISTANT: Thanks for reaching us, have a nice day.