You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: This is Charles Martin.

ASSISTANT: How can I help you today?

USER: I have to attend my uncle's house ceremony at Orlando, FL - MCO. Can you help me in booking flight ticket?

ASSISTANT: On which dates do you want to travel?

USER: I want to start my journey on 12/14 and return on 12/16.

ASSISTANT: Please tell me your source airport codes.

USER: My airport code is DC - DCA.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry Martin, no flight is available on your route.

USER: Ok, it is not an issue. Thanks for your information.

ASSISTANT: Most welcome.