You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you aid me to book a flight ticket from OAK to DTW?

ASSISTANT: Your travelling dates please?

USER: My trip dates are Dec 14 and Dec 16 respectively.

ASSISTANT:  Do you have any connection limit?

USER: I prefer for single connecting flight.

ASSISTANT: Is there any specifications?

USER: My return time is in the evening.

ASSISTANT: May I know your name please?

USER: Kimberly Martin here.

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

USER: Thank you.

ASSISTANT: Thank you for choosing us.