You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am John Brown.

ASSISTANT: How can I aid you Brown?

USER: I have a plan to go for music fest at Charlotte, please book a flight ticket under price 500.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Could you please share your travelling dates?

USER: My travelling dates are from 05/10 to 05/12.

ASSISTANT: May I know your travelling airport codes?

USER: I want to fly from JFK to CLT.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

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

USER: That's fine, thanks for the help.

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