Hi.
user
Hello, how can I help you today?
assistant
I want to change my existing reservation  due to some health issues. Can you help me with that?
user
Sure, may I know your name?
assistant
John Wright here.
user
Please wait a moment.
assistant
Sure.
user
Sorry to inform, no reservation found with your name.
assistant
That's ok, no problem. Thank you.
user
Thanks for reaching us.
assistant