You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you help me in finding a flight from MCO to EWR?

ASSISTANT: Sure, can you share your journey dates?

USER: My trip dates will be Dec 1st and Dec 3rd.

ASSISTANT: Do you have any preferences?

USER: I need a flight with a class economy.

ASSISTANT: May I know your name?

USER: I am Robert Smith.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: Its ok, thank you.

ASSISTANT: Thank you for opting us.