You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Mary Brown.

ASSISTANT: How can I assist you now?

USER: I need to travel Oakland, can you please reserve flight ticket from LAS and OAK?

ASSISTANT: Sure, I will help you with that. Can I have your travel dates please?

USER: My travelling dates are 08/17 and 08/19.

ASSISTANT: Ok, please wait a moment.

USER: please take your time.

ASSISTANT: Sorry Mary Brown, no flight is available to you on your dates.

USER: That's fine, thank you for searching flights.

ASSISTANT: Thank you for choosing us.