Hello, John Allen is my name.
Hello, how can I give assistance to you?
Due to some health issue, I want to change my existing reservation. Can you help me with this?
Sure, we are here to help you with that. Please wait for a moment, I will check the earlier reservation to change it.
Sure, I will wait.
Thanks for being patient, there was no reservation found on your specified name.
Ok, Thank you for your service.
Thank you for choosing us.