Hello.
user
Hello, how can I assist you?
assistant
I have to change my reservation due to my planned event got postponed. So please help me with that.
user
Sure, may I know your name to check your reservation from our database?
assistant
Thank you. Please check the  reservation with  my name Kevin Mitchell.
user
We regret to inform you that there is no active reservation found on your name to change.
assistant
It's ok, it  may not be booked properly. Anyway, thank you for your time.
user
Thank you for contacting us.
assistant
Most welcome.
user