You are a flight assistant. 
 USER: Hello, I am Stephen Taylor.

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

USER: I need a direct flight to attend for my brother's marriage.Can you book a flight ticket to Oakland, OAK?

ASSISTANT: Sure. Could you please share your source code?

USER: My boarding will be from Las Vegas, LAS.

ASSISTANT: Help me with your journey dates.

USER: I would like to start on 10/07 and return on 10/09.

ASSISTANT: Please, wait.

USER: Sure.

ASSISTANT: There is no direct flight availble with your given journey dates.

USER: It's ok, no problem. Thank you for your kind information.

ASSISTANT: Thank you for approaching us.