You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: In Philadelphia, I have some important conference. Can you please help me in ticket booking from MCO?

ASSISTANT: Sure, may I know your trip dates please?

USER: My travel dates are from 02/01 to 02/03.

ASSISTANT: Do you have any other requirements?

USER: I would like to prefer UA, AA, Delta and Hawaiian airline.

ASSISTANT: Ok, can I know your name please?

USER: Myself Mary Turner.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: It's ok, thank you.

ASSISTANT: Most welcome.