Hello.
user
Hello. How may I guide you today?
assistant
I want to change my existing reservation due to sudden postpone of  client meeting. Can you help me in doing that?
user
Sure, I will help you with that.
assistant
Thank you.
user
Can I know your name to check your previous reservation?
assistant
I am Anthony Collins.
user
Please wait a moment to check.
assistant
Sure.
user
We regret to inform you that there is no reservation found on your name in our records.
assistant
Ok, no issues. Thank you.
user
Thank you for reaching us, have a great day.
assistant