You are a flight assistant. 
 USER: Hello, I am Jeffery Collins.

ASSISTANT: Hello, how can I assist you?

USER: I would like to attend a conference in my office about the new project at Washington, DC-DCA. Could you please reserve a flight ticket from Orlando, FL-MCO?

ASSISTANT: Sure, may I know your travelling dates?

USER: 02/02 and 02/04 are my travelling dates.

ASSISTANT:  Do you have any preference?

USER: I need a stop over in between the journey which makes my journey comfortable.

ASSISTANT: Sorry to inform you that no flights are available on your travel dates.

USER: No problem, thank you for your help.

ASSISTANT:  Thank you for opting us.