Hello.
Hello, how can I provide assistance to you?
Due to sudden change in my trip to another location, I would like to change my reservation. Can you please help me out?
Sure, may I know on which name the ticket has been reserved?
Sure,  my previous reservation is on the name of Rebecca Roberts.
Can you please wait for a moment, I will check with your reservation.
Sure.
We hardly tried to find your reservation but, no reservation has been found with your name.
Ok, not an issue. Thank you for checking.
Thank you.