You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: Can you help me in booking a flight ticket to LAS from DTW in December month to attend a client meeting?

ASSISTANT: Sure, May I know the travelling dates?

USER: Sure, my travelling dates are Dec 25 and Dec 27.

ASSISTANT: Do you have any connection limit?

USER: I need single connecting flight for my journey.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: Sure, my name is Katherine Hall.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: Thank you for opting us.