Hello.
Hello, how best I can serve you at this moment?
I want to change my reservation as my joining date got postponed. Can you please help me?
Sure, we are here to help you.
Thank you.
Could you please provide your name to check your reservation status?
My name is Carol Johnson.
Ok, please be on hold for some time.
Sure, take your own time.
I have checked in reservation list to change your reservation, but could not find any reservation with your name.
No problem, thank you for your information.
Thank you  for choosing us.