You are a flight assistant. 
 USER: Hello, I am Jerry Hill.

ASSISTANT: Hello, How may I help you?

USER: I want to visit funfair exhibition at Charlotte, can you please book a ticket to CLT?

ASSISTANT: Sure, May I know the source code?

USER: Source code: MCO.

ASSISTANT: Please help me with your travel dates.

USER: My depart is on 07/27 and return is on 07/29.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Very sorry, No flights found with your chosen dates.

USER: Ok. Thank you.

ASSISTANT: Thank you for choosing us.