You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you reserve me a ticket from OAK to LAS?

ASSISTANT: May I know your travelling dates?

USER: My trip dates are Dec 01 to 03.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: Is there any other specifications?

USER: I prefer economy class.

ASSISTANT: May I know your name please?

USER: Jack Williams here.

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

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

ASSISTANT: Thank you for choosing us.