Hi. I am Jack Williams.
Hello, how may I aid you?
Due to my health problem I want to change my existing reservation, can you please help me to change my reservation?
Sure, I am here to aid you.
Thank you.
Please give me a minute, I will check the reservation on your name and revert to you.
Sure.
Thank you for your time, There was no reservation found on your given name.
Not a problem, thank you for the information.
Thank you for choosing us.