Hello.
user
Hello. How can I help you today?
assistant
Due to  my health issues, I want to change my reservation.Can you please help me for changing the existing reservation?
user
Sure, I can help you with it. May I know your name please?
assistant
Sure, my name is Edward Hall.
user
I am sorry Edward , there is no reservation with your details.
assistant
Ok, no problem. Thank you for your information.
user
Thank you for approaching us.
assistant