You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am planning to visit Oakland, can you please book me a ticket from DTW to OAK?

ASSISTANT: Sure, I am here to help you out. May I know your connection limit?

USER: I prefer connecting flight.

ASSISTANT: Can you please share your travelling dates ?

USER: My preferable journey dates are Apr 25 and Apr 27.

ASSISTANT: Is there any time concern?

USER: No.

ASSISTANT: Do you have any airline preference?

USER: I prefer normal cost airline.

ASSISTANT: May I know your name please?

USER: My name is Jeffrey Carter.

ASSISTANT: Jeffrey Carter, there are no flights available in your route.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for choosing us.