You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please reserve me a flight ticket from LAS to DCA?

ASSISTANT: Sure, may I know your trip dates please?

USER: My trip dates are Oct 10 and Oct 12.

ASSISTANT: Do you have any other requirements?

USER: I need a break in between my journey.

ASSISTANT: Can I know your name please?

USER: I am Dennis Hernandez.

ASSISTANT: Ok, please wait.

USER: Sure.

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

USER: Ok, no issues. Thank you for your response.

ASSISTANT: Most welcome.