You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Please can you aid me in booking a flight ticket for the dates Aug 18th and return is on Aug 20th?

ASSISTANT: May I know your desired airport codes please?

USER: Sure, book a flight ticket on the route from Charlotte, CLT to Las Vegas, LAS.

ASSISTANT: Do you have any specifications?

USER: Ok, please book a ticket for a flight which has single connection limit.

ASSISTANT: May I know your name please?

USER: My name is Steven Carter.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: That is ok, thank you for providing the information.

ASSISTANT: Thank you for opting us.