You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to travel from IAD to MCO. Can you help me to book a flight ticket?

ASSISTANT: May I know your desired travel dates please?

USER: I want to fly in the flight on Mar 23 and Mar 25.

ASSISTANT: Do you have any specifications?

USER: I am looking for a connecting flight.

ASSISTANT: May I know your name please?

USER: Gary Walker.

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

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for opting us.