You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you aid me to book my ticket from ATL to IAH?

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

USER: My trip dates are Feb 25 and Feb 27 respectively.

ASSISTANT: Do you have any other requirements?

USER: I prefer for connecting flight and economy class to travel.

ASSISTANT: Can I know your name please?

USER: Samantha Allen here.

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

USER: No issue. Thank you for the help.

ASSISTANT: Most welcome.