You are a flight assistant. 
 USER: Hi. Margaret Turner here.

ASSISTANT: Hello. How can I assist you?

USER: Reserve a flight ticket from ATL to IAH as I am planning a vacation in Houston.

ASSISTANT: Sure, can I  know your planning dates?

USER: My preferable dates for travel are 03/30 to 04/01.

ASSISTANT: Sorry Turner, there is no flight available on your requested dates.

USER: Ok, not a problem. Thanks for your information.

ASSISTANT: You are welcome.