Hi.
user
Hello, how can I aid you?
assistant
I want to change an existing  reservation due to sudden change in my trip Can you help me?
user
Sure, may I know your name to check with the status?
assistant
Jack Moore.
user
Please wait a moment while I check with the status.
assistant
Ok.
user
Thank you for waiting, regret to inform that there is no active reservation found under your name to change.
assistant
No issue. Thank you.
user
Thank you for reaching us.
assistant