Hello.
Hello, how may I aid you?
I have to change my reservation due to  my planned event got postponed. So please help me with that.
Sure, may I know your name?
Thank you. Please check the reservation with my name Daniel Jones.
Please give me a moment to check your ticket status.
Sure, take your time.
Sorry Daniel Jones, no reservation is available by your name.
Oh! It may not be booked properly due to server issues while booking. Anyway, thank you for your time.
Thank you for choosing us.