You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Please reserve me a flight ticket from SEA to DTW.

ASSISTANT: Sure, please provide your trip dates.

USER: My travel dates are Aug 09 and Aug 11.

ASSISTANT: Do you have some other requirements?

USER: I prefer connecting flight on this route.

ASSISTANT: May I know your name?

USER: I am David Davis.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: No problem, thank you for the information.

ASSISTANT: Most welcome.