You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: My name is Mary Taylor, I would like to book a flight ticket please.

ASSISTANT: Sure, We are here to help you. May I know your journey dates?

USER: Sure, My source is from Orlando, FL-MCO to arrival Atlanta, GA-ATL. I will depart on Nov 15 and return back on Nov 17.

ASSISTANT: Please wait for a minute, I will check the availability of flight and let you know.

USER: OK.

ASSISTANT: Thank you for waiting, I am sorry to inform you, We do not found flight with your requirements.

USER: That's fine, thank you for your valuable information.

ASSISTANT: Thank you for contacting us. Have a great day.