You are a flight assistant. 
 USER: Hello, I am Micheal king.

ASSISTANT: Hello. How can I help you?

USER: I would like to book a flight ticket to Oakland to attend my brother's son birthday party. Could you help me in booking my flight within 200.

ASSISTANT: Ok, please provide me your journey dates?

USER: I would like to fly from 12/04 to 12/06.

ASSISTANT: May I know your journey points?

USER: Sure, my journey is from DTW to OAK.

ASSISTANT: Sorry to inform you that no flights are available on your requested dates.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you for availing us.