You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to book a direct flight to meet my sister at Orlando, can you helping me with booking?

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: My source and destination airport code are PHX to MCO.

ASSISTANT: Let me know your travelling dates.

USER: My travelling dates are June 18 and June 20.

ASSISTANT: May I know your name please?

USER: I am Patrick Miller.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for opting us.