You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you for today?

USER: Dennis Parker here. I am a social activist, I have to host a campaign against gun culture at Detroit. So please book my ticket from Denver.

ASSISTANT: I am glad to help you with that. Can you please let me know your planned dates of your journey?

USER: My itinerary dates are 06/30 and 07/02.

ASSISTANT: Certainly, please provide your nearest airport codes.

USER: My genesis and terminus airport codes are DEN and DTW.

ASSISTANT: Please wait for a while, I will get a suitable flight for your journey.

USER: Sure.

ASSISTANT: Sorry to say this Parker, there are no flight which can travel to your region on your planned dates of your journey.

USER: No problem, thank you for checking.

ASSISTANT: You are welcome, thank you for reaching out here. Hope you have a nice day.