You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I want to book a flight ticket from MCO to DCA. Can you help me?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Ok, my planned trip dates are on Dec 15 and return on Dec 17.

ASSISTANT: Can I know your name please?

USER: Yes, I am Elizabeth Campbell.

ASSISTANT: Do you need any specifications?

USER: Ok, I need a single connecting flight. I don't have any other requirements.

ASSISTANT: Sorry, there are no flights found in our database.

USER: Ok, not an problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your help.