You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Amanda Campbell. Can you help me to book a flight ticket to DEN from DTW?

ASSISTANT: Can you please tell your travellnig dates?

USER: Ok, my travel dates are 02/25 and 02/27 respectively.

ASSISTANT: Please wait for a moment. Sorry, there are no flights available with your requested details.

USER: That's ok, thank you for assisting now.

ASSISTANT: Thank you and have a nice day.