You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My name is Barbara Martinez. I would like to travel from DCA to MCO on a business deal. Please help me in booking a ticket.

ASSISTANT: Sure, can you please help me with your dates?

USER: I am planning to travel on dates 12/11 and 12/13.

ASSISTANT: Sorry to say, there is no flight available on your preferred dates.

USER: That's fine. Thank you for the information.

ASSISTANT: Thank you and have a great day.