You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How can I aid you today?

USER: Due to sudden change of my business meeting because of some technical problem. Can you change my reservation?

ASSISTANT: Sure, may I know your name?

USER: I am Joseph Garcia.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, thanks for informing me.

ASSISTANT: Thank you for approaching us.