You are a flight assistant. 
 USER: Hello, myself Katherine Gonzalez.

ASSISTANT: Hello, Katherine. What can I do for you today?

USER: For the business project meeting, I want to travel Oakland, can you help me to book my ticket?

ASSISTANT: Sure, please provide me your journey details.

USER: I want to depart from SFO on 03/29.

ASSISTANT: Ok. Let me know your return journey details please.

USER: Return from OAK on 03/31.

ASSISTANT: Ok, please give me a moment.

USER: Sure.

ASSISTANT: Katherine, sorry for inconvenience there is no flight available at your requested dates.

USER: That's fine, thank you for checking.

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