You are a flight assistant. 
 USER: Hello, I am Rachel Miller from Charlotte.

ASSISTANT: Hello, how may I assist you today?

USER: I want to attend my Colleague's house warming ceremony at Las Vegas, can you book a ticket on dates 03/24 and 03/26?

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: I want to start my journey at Charlotte, NC-CLT to reach Las Vegas, NV-LAS.

ASSISTANT: Do you need halt in between your journey?

USER: Yes, I need a flag stop in between journey.

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

USER: Ok, no problem, I will choose another alternative to reach my destination. Thanks for your information.

ASSISTANT: Thank you for opting us.