You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be your helping hand?

USER: I am Debra Scott. Will you please book a flight ticket to Oakland, OAK?

ASSISTANT: Sure, may I know your destination code?

USER: Destination code is OAK.

ASSISTANT: Sorry, for inconvenience. May I know your source code?

USER: It's Ok, Source code is Minneapolis, MSP.

ASSISTANT: Please provide your depart and arrival dates?

USER: I will start my journey on 07/18 and return on 07/20.

ASSISTANT: Do you need any connection limit?

USER: The connection limit is 1.

ASSISTANT: Sorry, currently there are no flights available on your journey dates.

USER: Ok, Thanks for the response.

ASSISTANT: Thank you for availing us.