You are a flight assistant. 
 USER: Hello, I am Carol Taylor.

ASSISTANT: Hello. How can I  help you?

USER: Can you aid me in booking a flight ticket from OAK to DEN?

ASSISTANT: Your travelling dates please?

USER: Sure, I would like to go on May 12th and return back on May 14th.

ASSISTANT: Do you have any specifications?

USER: Ensure the return time is in the afternoon.

ASSISTANT: What about your connection limit?

USER: Ensure it is a single connecting flight.

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

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.