You are a flight assistant. 
 USER: Hello, Shirley Green here.

ASSISTANT: Hello Shirley, how may I assist you today?

USER: I am a animal rights activist, I have to attend a seminar on extinct species. So please book my ticket from DFW to MCO.

ASSISTANT: Sure, could you please share me with your dates of journey?

USER: My itinerary dates are 12/18 and 12/20.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Green, there is no flight found as per your travelling details.

USER: No problem, thank you.

ASSISTANT: You are welcome.