You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Gary Taylor. I am planning to visit MGM grand at LAS. Can you please book a ticket from DEN?

ASSISTANT: Sure, could you please provide your travelling dates?

USER: I would like to travel on 09/19 and return back on 09/21.

ASSISTANT: Ok, may I know your connection preference to proceed further?

USER: Make sure my connection limit is 1.

ASSISTANT: Sorry to say, there were no connected flight on your routes.

USER: That's fine.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: Thank you for your help.