You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I abet you?

USER: I am Thomas Lee, can you help me in reserving a ticket to Orlando, MCO?

ASSISTANT: Sure. Let me know your travelling dates.

USER: I would like to meet my favourite director on 04/23. And I will return on 04/25.

ASSISTANT: May I know your source code?

USER: I can start from Dallas, DFW.

ASSISTANT: Please wait for a while.

USER: Sure.

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

USER: Thank you for your information.

ASSISTANT: Thank you.