Hello.
user
Hello, how may I help you?
assistant
I need to change my reservation due to my planned event got postponed. So please help  me with that.
user
Sure, can I know your name?
assistant
Thank you. Myself Jack Smith.
user
Sorry, there is no reservation found on given name.
assistant
Oh! It may not booked properly due to server issues while booking. Anyway, thank you for your time.
user
Thank you for reaching us.
assistant
Most welcome.
user