You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My name is Robert Brown. I would like to travel from OAK to SFO, could you help me out?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My preferable dates are from 02/04 to 02/06.

ASSISTANT: Sorry for the inconvenience, there is no flight available on your requested dates.

USER: That's ok.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your time.