You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

USER: I am Brenda Edwards. I want to book a flight ticket to meet my childhood friend in Oakland, could you help me in booking a flight ticket?

ASSISTANT: Sure, may I know your journey dates?

USER: I would like to fly on 12/06 and return on 12/08.

ASSISTANT: Ok, please share your budget.

USER: I can afford up to 500.

ASSISTANT: Ok, can you please assign your journey airport codes?

USER: My source is Charlotte, NC - CLT and destination is CA - OAK.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Sorry to inform you that, there were no flights found on your request.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for availing us.