You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Mary Brown here. Can you reserve me a ticket from OAK to JFK?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: My trip dates are Aug 17 to 19.

ASSISTANT: Can you please share your connection limit?

USER: I need a direct flight.

ASSISTANT: Do you have any other specifications?

USER: I need economy class in normal-cost airline.

ASSISTANT:  Mary Brown , there are no flights available in your route.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for choosing us.