You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I want to book a direct flight ticket to meet my family, can you help me with booking?

ASSISTANT: Sure, May I know the travelling dates?

USER: My travelling dates are Mar 09 and Mar 11.

ASSISTANT: Please help me with your journey codes.

USER: I will fly from OAK my nearest airport to reach DTW.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: I am Matthew Roberts.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for availing us.