You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My name is John Thomas. I would like to travel from ATL to MCO, could you help me out?

ASSISTANT: May I know your desired travel dates please?

USER: My preferable dates are from 03/21 to 03/23.

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

USER: That's ok. Thank you for your time.

ASSISTANT: Thank you for opting us.