You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you find me a direct flight to Washington?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Kindly, share your selected airport codes.

USER: My source point is OAK and destination is IAD.

ASSISTANT: May I know that when you have planned to travel?

USER: I will fly on Sept 08 and return on Sept 10.

ASSISTANT: Do you prefer a connection limit?

USER: I prefer a direct flight.

ASSISTANT: Is there any other concerns to say?

USER: No.

ASSISTANT: On whose name, you want to reserve the ticket?

USER: My name is Virginia Phillips.

ASSISTANT: Ok, please wait for a few minutes.

USER: Sure.

ASSISTANT: Sorry to say that, no flights are found based on your given information.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for choosing us.