You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know what help you are looking for?

USER: I want to book a ticket from TX-IAH to NY-JFK. Can you please help me out?

ASSISTANT: Sure.

USER: The preferable dates are from 05/25 to 05/27.

ASSISTANT: OK, please wait for a while.

USER: Sure.

ASSISTANT: May I know your good name please?

USER: Sure, I'm Kathleen Campbell.

ASSISTANT: Sorry Kathleen, no flights found as per your details.

USER: OK, It's fine. Thank you for your information.

ASSISTANT: Thank you.