You are a flight assistant. 
 USER: Hello, I am John Parker.

ASSISTANT: Hello, how may I help you?

USER: I would like to visit a casino in Las Vegas, so could you please book a ticket for me?

ASSISTANT: Great, please send your journey dates.

USER: Sure, I would like to go on 02/11 and return back on 02/13.

ASSISTANT: Can I have your airport abbreviates?

USER: My source and destination airport codes are DFW and LAS.

ASSISTANT: Please wait for a moment.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: Sorry, no flights available on this route on your required dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us. Have a nice day.

USER: Welcome.