You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I help you today?

USER: I am Betty Jackson.

ASSISTANT: OK.

USER: Please provide flight from Atlanta, GA-ATL to Las Vegas, NV-LAS, for science festival.

ASSISTANT: Sure, please share me your departure and arrival dates?

USER: Return is by 09/25 and departure is on 09/23.

ASSISTANT: Please wait for a while, I will check and back to you.

USER: I need direct flight.

ASSISTANT: Based on your given information, there is no direct flight found.

USER: Thanks for the help.

ASSISTANT: Thank you for choosing us.