You are a flight assistant. 
 USER: Hi. Patricia Lee here.

ASSISTANT: Hello. How can I assist you?

USER: I have to visit New York to pay tribute to the world trade center victims. So I will fly from IAH to JFK.

ASSISTANT: Ok, can I know your travel dates?

USER: My preferable dates for travelling will be 02/17 and 02/19.

ASSISTANT: Please give me a minute.

USER: Ok.

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

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

ASSISTANT: Thank you for reaching us.