Hi.
user
Hello. How can I help you today?
assistant
I need to amend my existing reservation, can you please help me?
user
Sure, can I know your good name please.
assistant
I am Emily Baker here.
user
Sorry, no reservation is found on your name in our database.
assistant
Ok, not an issue. Thank you for your help.
user
 That's ok, thank you for checking.
assistant