Hello.
user
Hello. How may I help you?
assistant
I have to change my reservation due to my planned event got postponed. So please  help me with that.
user
May I know your name please?
assistant
Thank you. Please check the reservation with my name Donna Hernandez.
user
Sorry, there is no reservation found in our database.
assistant
Oh! It may not be booked properly due to server issues while booking. Anyway, thank you for your time.
user
Thank you for choosing us.
assistant
Most welcome.
user