Hello. I am Charles Collins.
user
Hello, how can I serve you?
assistant
I want to change my existing reservation due to postpone of my interview at Washington. Could you please help me?
user
Sure, I am here to help you. Please wait for a while.
assistant
Sure.
user
Sorry to inform that, there is no reservation found on your given name.
assistant
No worries, thank you for the information.
user
Thanks for reaching us, have a nice day.
assistant