Hello.
user
Hello. How can I provide assistance to you?
assistant
I want to change my existing reservation, can you please help me with this?
user
Sure, I will help you in changing. May I know your good name please?
assistant
I am Charles Robinson.
user
Please give me a moment.
assistant
Sure.
user
Unfortunately there is no reservation found with your given name.
assistant
Ok, no problem. Thank you for your information.
user
Thank you for opting us.
assistant