You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how could I help you best today?

USER: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT: Sure, I am here to help you my best.

USER: Thank you.

ASSISTANT: Let me know your name to check your reservation?

USER: I am Stephen Young.

ASSISTANT: Sorry, we did not find any active reservation on your name.

USER: Ok, no issues.

ASSISTANT: Thanks for approaching us, have a good day.

USER: Thanks for the information.