You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: My name is Carol Taylor, I want a normal-cost airline to visit Las Vegas for short vacation. Can you book a flight for me?

ASSISTANT: Sure, let me know your travelling dates?

USER: I will travel on 18th Sept and return on 20th Sept.

ASSISTANT: Please share your source airport code?

USER: My source point is DFW airport.

ASSISTANT: May I know your connection limit?

USER: I need a direct fight for this journey.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there is no flight found on your requested dates of journey.

USER: Ok,I will replan my trip. Thank you for helping me.

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