Hello.
user
Hello, how may I help you today?
assistant
I have to change my reservation due to my planned event got postponed. So please  help me with that.
user
Sure, I can change your reservation right now. Before that I need to know your good name please?
assistant
Thank you. Please check the reservation with my name Dennis Hall.
user
Please wait a minute.
assistant
Sure, take your time.
user
Sorry to say that, there is no active reservation found on your name.
assistant
Oh! It may not be booked properly. Anyway, thank you for your time.
user
Thank you for opting us.
assistant
Most welcome.
user