Hello.
user
Hello. How may I assist you?
assistant
I am Rebecca Carter. I need to change my reservation due to my planned event got postponed. So please  help me with changing my reservation.
user
Sure, I will help you.
assistant
Thank you.
user
Please wait a moment.
assistant
Sure, I will wait for your response.
user
Sorry there is no reservation on  your name.
assistant
Oh! it may not be booked properly due to server issues while booking. Anyway, thank you for your time.
user
Thank you.
assistant
Most welcome.
user