You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you today?

USER: Stephanie Hall here. I want to enjoy my birthday at Las Vegas, so please book my ticket from Charlotte.

ASSISTANT: Ok, I can book a better flight for you. Please share your preferable travel dates?

USER: My trip dates are 03/29 and 03/31.

ASSISTANT: Ok, I need Las Vegas and Charlotte airport codes?

USER: My genesis and terminus airport codes are CLT and LAS.

ASSISTANT: Sorry Stephanie Hall, currently no flights are running on your desired route.

USER: No problem, I will find an alternative way to travel.

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

USER: Thank you for your assistance.