You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you now?

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

ASSISTANT: Sure, I will help you with that. Can I have your travel dates  please?

USER: Sure, my journey dates are Jun 12 and Jun 14.

ASSISTANT: Ok,  please let me know your  preferable timings of  your  journey.

USER: I am comfortable with any time.

ASSISTANT: Do you have any other specifications?

USER: I prefer maximum one connection.

ASSISTANT: Can I have your  good name please?

USER: Sure, Brenda Williams here.

ASSISTANT: Sorry to inform you that no flight is available to you on your  planned dates.

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

ASSISTANT: Thank you for choosing us, have a good day.