Hello.
user
Hello. How can I help you?
assistant
I want to change my existing reservation. Could you help me with that?
user
Sure, I will help you to change your reservation.
assistant
Thank you.
user
Ok, please mention your name.
assistant
Mary Lopez.
user
Sorry, no reservation found on your name to change your reservation.
assistant
That's ok, Thank you.
user
Welcome, have a nice day.
assistant