You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I am Nancy Jones.

ASSISTANT: Hello Nancy.

USER: I want to attend for an interview in MCO, can you please help me to book a flight ticket from IAD?

ASSISTANT: Sure, I will help you on that.

USER: Sure, my dates are from 12/21 to 12/23.

ASSISTANT: Ok, please hold on a moment to check the availability of flights and I will revert you back.

USER: Sure.

ASSISTANT: Sorry to inform you, there are no flights found with  your requested dates of travelling.

USER: No problem. Thank you.

ASSISTANT: Thank you for approaching us, have a great day.