You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you today?

USER: I need a direct flight to attend business meeting at Oakland, OAK.So, can you please reserve a flight ticket?

ASSISTANT: Sure, I will help you. May I know your boarding point please?

USER: My origin point is Washington, DCA.

ASSISTANT: When do you want to travel?

USER: I want to start my trip on 10/16 and return on 10/18.

ASSISTANT: Please standby, let me check a flight for you.

USER: Sure.

ASSISTANT: Unfortunately, there are no flights found on your route.

USER: It's ok, thank you for the information.

ASSISTANT: Your good name please.

USER: I am Matthew Green.

ASSISTANT: Thank you, have a great day.