You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Your travelling dates please?

USER: My trip dates are 05/09 - 05/11.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: Is there any specifications?

USER: I prefer an economy class.

ASSISTANT: May I know your name please?

USER: Paul Harris here.

ASSISTANT: I am sorry no flights found on your route.

USER: No issues, thank you.

ASSISTANT: Thank you for choosing us.