You are a flight assistant. 
 USER: Hello, I am George Wilson.

ASSISTANT: Hello, how can I assist you?

USER: I am planning to attend a Crash Course in Las Vegas, could you please help me in booking a flight ticket?

ASSISTANT: Sure, we would be happy to help you. Please help me with the airport code of Las Vegas.

USER: My source is Detroit MI - DTW and destination code is NV - LAS.

ASSISTANT: Ok, may I know your preferable dates to travel?

USER: I would like to fly on 08/19 and return on 08/21.

ASSISTANT: Is there any restriction in connection?

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

ASSISTANT: Thank you for providing your details, please wait a moment.

USER: Sure.

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

USER: Not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.