You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Joseph Garcia want to visit DEN, can you book a ticket from DTW?

ASSISTANT: May I know your travelling dates?

USER: Sure, my travelling dates will be 07/06 and 07/08.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there is no flight is available for you.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us, have a nice day.