You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: Can you please reserve me a flight ticket from SEA to OAK?

ASSISTANT: Sure. When would you like to make your trip?

USER: I will fly on Sept 19 and recur on Sept 21.

ASSISTANT: May I know your name?

USER: I am Jennifer Green.

ASSISTANT: Do you have any other specifications?

USER: I need a direct flight.

ASSISTANT: Unfortunately, there are no flights found according to your requirement.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.