Hello.
user
Hello, how may I serve you?
assistant
My Interview was pre-planned at the last minute, will you please help me to change it as soon as possible?
user
Sure, I will help you. Please provide the name on which ticket was reserved.
assistant
My name is Ronald Hall.
user
Sorry, there is no reservation existing on your name.
assistant
   That's fine, thank you for the response.
user
You are welcome, have a nice day.
assistant