You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brian Hill.

ASSISTANT: How can I help you out today?

USER: I am planning to visit DEN to meet my brother, can you please find a flight from OAK?

ASSISTANT: May I know your travelling dates please?

USER: Sure, my travelling dates are 09/29 and 10/01.

ASSISTANT: Sorry, there is no flights are  available on your desired dates.

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

ASSISTANT: Welcome Brian Hill.