You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: I need to book a flight ticket from DTW to DFW, can you help me in booking a flight ticket?

ASSISTANT: Sure, let me know your travelling dates.

USER: Sure, my journey dates are May 19 and May 21.

ASSISTANT: Do you want connecting flight or direct flight?

USER: I prefer maximum one connection.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: May I know your name please?

USER: Sure, Elizabeth Davis here.

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

USER: Ok, no worries at all. Thank you for your information.

ASSISTANT: Thank you for opting us.