You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to flight booking agency.

USER: I'm Jason Miller.

ASSISTANT: How can I guide you for today?

USER: I am planning to attend live music concert at Charlotte, can you please help me with booking a flight ticket?

ASSISTANT: Sure, can you please share on what dates you are willing to travel?

USER: Sure, I would like to take off on 09/25 and return back from Charlotte on 09/27.

ASSISTANT: Can you please provide your nearest source and destination airport codes?

USER: My source airport code is OAK and the destination airport code is CLT.

ASSISTANT: Do you have any other requirements?

USER: Yes, please make sure that the price limit does not exceed 500.

ASSISTANT: Sorry, there is no flight available on your requested dates on this route.

USER: Ok, no issues. I will try another alternate way to complete my trip. Anyways, thank you for checking.

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

USER: You are welcome.