Hello.
Hello, how can I amend you?
I am Kevin Williams. Will you assist me in changing my reservation as my plan to attend  for a film festival got postponed?
Sure, I am here to help you.
 Thank you.
Please wait for a while, I will check your reservation.
Sure.
Thank you for your help. I am here to inform you that, there is no reservation found on your name.
Not an issue, thank you for the information.
Thank you for reaching us.