You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to attend my friend's engagement from DEN to LAS. Can you find a ticket for me?

ASSISTANT: Sure, may I know your journey dates?

USER: Sure, my travelling dates are 10/14 to 10/16.

ASSISTANT: Sorry, unfortunately there is no flight with your requested dates. May I know your name for formalities.

USER: Yes, I am Shirley Allen. Ok, thank you for your help.

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