You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you now?

USER: I have to attend a conference meeting in New York, could you please help me to book a flight ticket from IAD to JFK?

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: I am happy for your quick response. My preferable journey dates are 13-Feb and 15-Feb.

ASSISTANT: Ok, please let me know your preferable class.

USER: I am willing to travel in an economy class flight.

ASSISTANT: Do you have any other specifications?

USER: I prefer a single connecting flight for my journey.

ASSISTANT: Can I have your good name please?

USER: My name is Rachel Harris.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry  Rachel Harris, no flight is available to you on your dates.

USER: It's ok, not a problem with that. Thank you for searching the flights.

ASSISTANT: Thank you for choosing us, have a good day.

USER: Welcome.