You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: Can you book a business class ticket from HOU to DTW?

ASSISTANT: Ok, I will help you with that. Can I know your travelling dates?

USER: I will start on Aug, 24 and return back on Aug, 26.

ASSISTANT: May I know your name?

USER: Dennis Evans here.

ASSISTANT: Ok, do you have any other requirements?

USER: I need a connecting flight.

ASSISTANT: Ok, wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling.

USER: It's ok, no worries.

ASSISTANT: Thank you for reaching us.

USER: Thank you.