Hello.
user
Hello.
assistant
I am Jonathan Mitchell.
user
Mitchell, how may I help you?
assistant
I am planning to change an existing  reservation, due to health issue. Can you please change my reservation?
user
Sure, please give me a moment to check your ticket status.
assistant
Sure, take your own time.
user
Sorry Jonathan, no reservation is available by your name.
assistant
That's fine. Thank you for your service.
user
Thank you for contacting us.
assistant