You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I want to schedule my trip from OAK to DCA, can you please reserve me a flight ticket?

ASSISTANT: Sure, may I know your preferred dates of travel?

USER: My preferable travel dates are from Sept 2nd to Sept 4th.

ASSISTANT: Do you have any connection limit?

USER: Yes, I would prefer a single connection in between my journey.

ASSISTANT: Any other specifications?

USER: No.

ASSISTANT: May I know your name?

USER: I am Nicholas Anderson.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your preferred dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.