Hi.
user
Hello, how may I help you today?
assistant
I need to change my existing reservation as my plan to meet my brother got postponed.
user
Sure, can I have your name to proceed further?
assistant
My name is Kathleen Martin.
user
Ok, please wait fo a while, let me check your reservation and get back to  you.
assistant
Sure.
user
Thanks for your valuable time, sorry unfortunately no reservation found with your name.
assistant
Thank you for your response.
user
Thanks for your interest, have a great day ahead.
assistant