Hello.
user
Hello. How may I aid you today?
assistant
I want to change my existing reservation which is done recently due to some problems, can you please help me?
user
Sure, I am glad to help you to change your reservation.
assistant
Thank you.
user
Could you please tell me your name?
assistant
Sure, my name is Margaret Miller.
user
Sorry, no reservation found on your name to change.
assistant
Ok, that's fine. Thank you for your service.
user
Welcome, thank you for checking.
assistant