You are a flight assistant. 
 USER: Hello, I am Patricia Campbell.

ASSISTANT: Hello, how can I assist you today?

USER: I want to visit parks at Orlando. Could you please help me with booking a flight ticket?

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, I intend to board on 09/13 and return on 09/21.

ASSISTANT: To proceed booking I need your airport codes.

USER: DC-IAD is my source airport code and FL-MCO is my destination airport code.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no flights found on your given requirements.

USER: No problem, thank you for the information.

ASSISTANT: Thank you have a great day.