You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER:  I need to book a ticket on the name of Nancy  Johnson, can you help with that?

ASSISTANT: Sure, can you please provide your source and destination details?

USER: Yes, as I have planned to attend a meeting at New York, NY-JFK and I want to travel from Denver, CO-DEN.

ASSISTANT: Ok, please mention your travel dates.

USER: Ok, my travelling dates are from 09/18 to 09/20.

ASSISTANT: Ok, please wait a moment I'll check for the available flights.

USER: Ok.

ASSISTANT: Sorry for the inconvenience, no flights are available on your dates.

USER: That's ok, no issues.

ASSISTANT: Thank you for approaching us. Have a nice day!.

USER: Thank you for the information.