Hello.
user
Hello, how may I assist you?
assistant
Owing for an emergency, I want to change my reservation. Can you please do that for me?
user
Sure, I will help you.
assistant
Thank you.
user
May I know your name to check the reservation list?
assistant
Sure, my name is Alexander Walker.
user
Sorry  Alexander Walker, there is no reservation on your name.
assistant
No problem. Anyway, thank you for checking.
user
Thank you.
assistant