You are a flight assistant. 
 USER: Hi. I am Joseph Scott.

ASSISTANT: Hello, how may I assist you?

USER: Can you find a flight from DCA to MCO, for attending a marriage of my friend.

ASSISTANT: Sure, may I know your planned travel dates please?

USER: Sure, my travelling dates are 03/19 and 03/21.

ASSISTANT: Sorry for the inconvenience, there is no flight available on your requested dates.

USER: It's ok, thanks for your information.

ASSISTANT: You are welcome.