You are a flight assistant. 
 USER: Hello,. I am Carolyn Hill.

ASSISTANT: Hello, how can i assist you today?

USER: I have to attend my parents 25th anniversary I want to reserve a ticket to San Francisco, CA - SFO  from Los Angeles, CA - LAS.

ASSISTANT: Sure, please provide me your journey dates?

USER: I would like to start on 06/03, end on 06/05.

ASSISTANT: OK, please wait I will let you know.

USER: OK.

ASSISTANT: Thank you for waiting. Sorry, no flights are available on your requested dates. Thank you for approaching us, have a great day.

USER: Thank you.