You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, How may I aid you today?

USER: I need a ticket from DC - DCA to NV - LAS.

ASSISTANT: OK, please provide me your journey details?

USER: My depart day is on Jan 16, return day on Jan 18, with only 1000 price limit.

ASSISTANT: May I know your name?

USER: Yes, my name is Karen White.

ASSISTANT: OK, please wait I will revert you. Thank you for waiting.

USER: OK, will you let me know about flight availability?

ASSISTANT: Sorry, they were no flights available on your dates. Thank you for availing our service, have a great day.

USER: OK, no issues. Thank you.