Hello.
Hello. How can I assist you?
Owing to an emergency, I want to change my existing reservation. Can you help me?
Sure, I will help you.
Thank you.
May I know your good name to check the reservation status?
Yes, I am Samantha Smith.
Please, wait for a while.
Ok, I will.
Thank you for waiting, there is no reservation found on your  name to change.
Ok, not an issue. Thank you for your information.
Thank you for approaching us.