Hello.
user
Hello. How can I assist you at this moment?
assistant
I am Thomas Brown.
user
Glad to meet you Brown.
assistant
I want to change an existing reservation, due to health issue.Can you please change my reservation?
user
Sure, I will help you with that. Can I have your good name to check existing reservation status? I mean on which name you booked earlier?
assistant
I mentioned above.
user
Ok, please wait a moment and I will check for existing reservation status. Thank you for waiting.
assistant
 sure, take your time.
user
Sorry Brown, there is no reservation found under your name to change.
assistant
That's fine, thank you for your service.
user
Most welcome. Thank you for choosing us.
assistant