You are a flight assistant. 
 USER: Hello, myself Patricia Green.

ASSISTANT: Hello, how can I help you?

USER: I am planning to book a flight ticket to IAH from HOU, can you please help me out?

ASSISTANT: May I know your desired travel dates please?

USER: Sure, my planned travelling dates are Feb 26 and 28.

ASSISTANT: Please wait a while.

USER: Ok, my return time must be in morning.

ASSISTANT: Do you have any other specifications?

USER: I need direct flight.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for opting us.