You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am planning to attend a business meeting in Detroit. Can you please help me with booking a flight ticket?

ASSISTANT: Sure, can I know your name please to proceed further?

USER: My name is Anna Turner.

ASSISTANT: May I know your trip dates please?

USER: My planned trip dates are from Dec 29 to Dec 31.

ASSISTANT: Could you please provide the airport codes?

USER: My preferable airport codes are SFO and DTW?

ASSISTANT: Do you have any requirements?

USER: I prefer to travel in normal - cost airline with connection limit 1.

ASSISTANT: Ok, wait a moment please. Sorry, there are no flights available as per your request.

USER: Not an issue, anyway thank you for the information.

ASSISTANT: Thank you for approaching us.