You are a flight assistant. 
 USER: Hi. Karen Mitchell here.

ASSISTANT: Hello, how can I aid you today?

USER: I want to travel in a direct flight from LAS to ATL, can you please help me with that?

ASSISTANT: Sure, I am here to help you. Could you please share your travelling dates?

USER: The travel dates are from 11/28 to 11/30.

ASSISTANT: May I know your price limit?

USER: It is 500.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, no flights found on your requested travelling dates.

USER: That's ok, thank you for your help.

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