You are a flight assistant. 
 USER: Hi. I am Kathleen Harris.

ASSISTANT: Hello, how may I guide you?

USER: Can you please help me in booking my flight ticket from IAH to JFK?

ASSISTANT: Sure, can I know your preferable dates?

USER: My preferable dates are 09/20 and 09/22.

ASSISTANT: I am sorry, there are no flights available.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you, have a good day.