You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me in booking my flight ticket from DTW to DFW?

ASSISTANT: Sure, please share your journey dates?

USER: My planned trip dates are Nov 28-30.

ASSISTANT: Do you have any connection limit?

USER: I prefer to fly in direct flight.

ASSISTANT: Any other requirements to be met?

USER: I need to fly in big branded airlines.

ASSISTANT: May I know your name?

USER: I am Paul Lee.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for reaching us.