You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Cynthia Carter. I would like to visit HOU from IAD for a business meeting, can you please help me out with booking of a flight ticket?

ASSISTANT: May I know your desired travel dates please?

USER: My trip dates are 12/10 to 12/12. I need a direct flight.

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

USER: No issue, thank you.

ASSISTANT: Thank you for opting us.