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 am here to help you with that. May I know your good name?
assistant
Thank you. Please check the reservation with my name John Hall.
user
Ok, please wait for a minute.
assistant
Sure, take your time.
user
Sorry to say that, there is no reservation found on your name in our database.
assistant
Oh! It may not be booked properly. Anyway, thank you for your time.
user
Thank you for reaching us.
assistant
Most welcome.
user